Mine also due to medical issues this year. First thing I did was take some refresher lessons with the pros at my course and continue to work with one of the pros on a regular basis. "See a PGA teacher/instructor". Mine is all about alignment and tempo and it is going to take some time to get it worked out.

Been where you are and feel your pain.
It’ll be different for everyone but I’ve tended to go back to basics. Check my fundamentals first; neutral to slightly strong grip. Alignment; get some sticks or a couple of clubs down on the floor and check feet, knees, hips and shoulders are square, also use them to check your ball position.
I’d then take one ‘fault’ at a time and work on the feelings needed. If I’m not sure what to work on I’d always book a quick lesson so a pro can take a look and set me right.
I hope you find your swing again soon. Patience is key, it happens to all of us, it’s a frustrating game.

Golf is a head game. Put each shot behind you and keep thinking you can't change the past, need to move forward and be better than the last. Think positive. Even with "negative" practice, you will not improve.

Beer also helps

I have encountered this in the past and when I get super frustrated like this, I do two things. I take a break first. I a week or two completely away from the game. Second, I go to field and start hitting shots with a pitching wedge, then walk to where it is and hit it again... this takes me back to my start in the game. Once I feel like I start to groove that shot, then I'll head to the range and use more clubs, then play a round.

It is difficult for me to do this because I truly love playing, but sometimes, it is best to step away for a couple weeks. Everyone has low spots, and even the pros take a break.

I know it's tempting, but sometimes taking a break works. I always wanna golf but sometimes I've gotta take a week or a few weeks off to regroup. Then I'll start hitting the range again to just work on some things. Just don't let it get too much into your head, you'll eventually get back to how you used to play and it should be fine.

I'm channeling my instructor for this, but mentally, remember why you love the game (even if in that moment you don't), take a breath, and be present in the surrounding -- don't let the frustration or helpless feeling take over.

Mechanically, do you have a controlled swing/shot that you can use? Maybe a three-quarters swing that's reducing your variables? Are you missing a pre-shot routine or sequence step? I have a stock shot I can lean on, I lose distance but it stays relatively straight and I can eat the elephant vs. play army golf.

Strategy-wise, I reduce my chances for big misses and will take irons off the tee or a hybrid, something I can find a fairway with while keeping my tee-height low. I've even gone up a tee box to stick with irons and wedges just to get some confidence back.

But at a base level, if you don't have one already, find an instructor to take a look at things. Even if it's virtually on Skillest or something.

I couldn't hit the broad side of a barn with my driver, and I was hitting my irons fat or thin. What worked for me was going to a practice range and trying to hit my driver only 150 yards. My swing got shorter and my tempo was better. I had been trying too hard.

Slowly I took that swing and then got a bit longer, but still retaining the ease and tempo. Then I took that to the rest of my clubs. I got my confidence back.

I like Craig's response; step back and take a break.Clear your mind for a week or two. If your slump is caused by faulty swing mechanics, all you're doing by continuing to play is adding to the problem.
When you pick up a club again, start hitting wedges and short irons. Having someone record your first range session might not be a bad idea.

We've all been there. Best of luck.

Craig is correct. Take a step back put the clubs in the garage clear your mind before you start back. A mental break always helps.

I definitely feel your pain after having my second kids, I took a year off from golf and at first attempt to restart I couldn't hit a club to save my life.
I struggled thru last season, had a few lessons over the winter but the instructor was more interested in pushing his 10 lesson package than helping me improve.
Fast forward 3 months later, had a lesson from a local reccomended pro that fixed me up with some basic drills.

I like to create a game within the game when I am off track.
Don't keep doing the same thing.

Example - try to hit middle of fairway / middle of green without worrying about distance. Swing at 75%. I also go more to choked down 1/2 swings with iron shots, result is typically crisper contact and about the same distance as crappy full shots.

Get back to simple basics, try to enjoy the game again.

I go back to basics on the range when I’m in a slump. I start with grip, shoulders, hips, and follow through doing dry swings for 10-15 minutes before striking a ball. Then ill go through a progress of 1/4 - 3/4 swing working on making sure I’m shallowing the club to get to a good impact position. I also spend an hour plus working on short game for 125 yds and in with my wedges.

Some great suggestions here. Thank you all for your suggestions/pointers.

Had an okish round yesterday, shot 30 points around a course I’ve not played before and took 31 putts over the round (15 handicapper)

My short game saved me a few times, let me down twice I think. It was pretty windy too so I’m not beating myself up today at least.

There will always be an aspect of the game that we're technically struggling with, the game is hard. And confusing. My buddy is an amazing bowler, cumulative average is over 235, he thinks he's in a slump. It's all relative. My slumps are what most people aspire to do. I'm upside down around the greens right now, it's awful. Bottom line, go back to fundamentals, check with your teacher. If you want to be really good, you need a teacher. Take a break, re-evaluate.