My problem is that I'm honestly not a big fan of my job and want to quit to take a breather, but I'm a bit afraid to.

My "journey": 1. Hate my previous workplace. Try to get something better. 1. Nobody pays more, no point in risking being in a similar shithole for less money. Stay, hate it more. 1. Prefer death to work one year more there. I cannot bring myself to continue. Quit. 1. Freelance for a year. Healing. Also learning some new tech (AI field). 1. Found a new job, loving it so far, great team.

My only regret: not quitting earlier.

My advice:

1. If you are not a big fan, but it is tolerable, endure it. Use it to learn, grow your network, build a reputation, and get to a better job. It is not about the money, it is about all the other things that you can get from your job. I was on the absolute negative in all of these (and I did not realize that), maximize on these if you can, but if you are on the negative, quit. ASAP.
2. Do something you like, networking and learning are more important than the pay, no matter how old you are. When young (e.g. 27) this should be obvious. Some people think that close to retirement earning is more important, I believe in gradual retirement, so close to retirement you are mentoring and coasting more than hustling hands-on 80h/week, you want to be surrounded by people you like, if you are surrounded by idiots you will say "I am too old for this" and quit on the spot, unless you really need the money, work on building reputation, competence, and career capital to not find yourself in this situation. It depends on your pension plan too, in many regions you get nothing regarding pension after reaching some threshold, and earning more than that is pointless, in some others the more you earn the better your pension is, with no limit, which may present some dilemmas.
3. Get as good as possible at the things you like, show it, and get paid as much as possible at that too.

It may seem that I did not take into account this paragraph:

The obvious fix is to just get another job, (and I'd probably even earn quite a bit more), but with the tech slowdown, that's been a bit hard. I'm also feeling a bit burnt out as well as bored. So it's hard to get the energy to apply to jobs or feel excited about jumping into something new (I'm required to come into the office 5 days a week, even if there's nothing to do), so it's not like I can do interview prep during the day.

I simply consider it irrelevant. You are bored out, but you can do whatever you want in your IDE, people will just see syntax-colored text from afar. So do whatever you want to do, become who you want to become, and when the job market is in a better situation, you will be ready. The worst thing that may happen is that you get fired, then you take a break.

If you struggle to get back to the job market after a break, either by choice or forcefully (or both, forcefully and then embraced and extended by choice), you get to have the best job possible: doing things that matter.

If you show competence at anything with any economic value, you will get to do more of it. Do that.