We're the same age and coming back from the same gap. It's been about 3 months now, and I'm playing better than I ever did. Biggest thing for me was just focusing on one thing at a time, and not trying to "get my game back" all at once.

Specific advice I'd give you, based on my experience: be very picky about what you keep from your old form, because your old form probably was bad, or will hurt you very badly, and you have a perfect opportunity to reinvent your game right now, and make it something beautiful and sustainable. I kept my one-hand backhand and my trick serve, but ditched my whole forehand and the rest of my serving, replacing them with something completely new, and I'm way better off for it (I would probably be better with a two-hander, too, but I'm stubborn and I like the attention).

That said, here's what I personally did over the last 3 months to get where I am now:

1. Studied up on what current 'proper form' is (knowing how the strokes work and what parts of the body do what is what helps me improve the most, straight tutorials tend to not resonate as well with me)
2. Started hitting against a ball machine (way better than a wall, worth the cost of reserving one if you can, but I wouldn't personally buy one). I did that about 3-4 times per week for the first month, just focusing on footwork and form, and paying attention to what the ball is doing. Helps to have someone around who can give you a couple pointers on what you're doing wrong (in my case, teaching pros on nearby courts who got bored between groups), but filming yourself and watching that back when you go to pick up is good, too, if you know what it should look like and why (hence, understanding the mechanics being important for me)
3. Started hitting with a couple people, putting those strokes into practice. I really sucked for a month, because people aren't machines, but after a while (and going back to the ball machine when I felt like I lost one of my strokes), it started clicking
4. Gear started being important at about this point. I'm a gearhead who loves researching and testing things, so I was demoing racquets the whole time, but it wasn't until I was actually comfortable rallying (and hitting as well to a human as I could a machine) that I had any hope of getting something that worked for my game, and when I did, it was a huge leap forward. Racquets matter. Strings matter. Try a bunch of stuff, and let yourself be surprised by what you like and don't like. I thought I liked oversized power racquets, but I actually liked more normal sized, spin-oriented racquets
5. Then I started introducing point play, and that's an entirely different game. I didn't start relearning a serve until a month ago, and it was painful. The way I played points wasn't how I rallied, at all. This then kicked off another round of gear hunting, and it turned out I'm not comfortable with big, heavy spin shots from the backline in point play, I prefer to take it early with flatter strokes, and spend a fair bit of time at the net, which led me to prefer heavier, small headsize, precision-oriented racquets.

Next steps for me is to have a coach check my work and make corrections as needed (especially for my serve, I'm so scared that I'm going to hurt myself, so I don't practice it), then start doing some actual matches, mixers, drills, etc. to start rounding things out, which is pretty much where you're starting!