As someone who went through just a hell time of burnout from art and underemployment in my 20's, I feel you on a very deep level here. I know it's really hard to step away and feel like there is no room or time to take a break when it's like, "but I desperately need to make money, though." The problem is, when you do that, you train your body to hate the thing you love. My first stab at the art world ended very poorly for me. I got carpel tunnel so badly in my hand that the shooting pain went all the way from my fingertips to my armpit, and after that much negative conditioning with drawing I...gave up drawing for a year, was completely done with art. Was never going to turn back, but long story short, I came back to it.
What helped me to love art again (Because I do love it again, it took a while, but I can finally say again that I do love it) was recognizing that a lot of the pressures I was feeling from clients and from social media, especially, that feeling of being forever behind on everything, that feeling that everyone has figured this out but me, the feeling that everyone was disappointed at my lack of success--that was a lot of perceived pressure that wasn't really there. Yes I had classes to do, yes I had work to do for money, yes I had several jobs, but did I have to update my comic on time every week just because that John Doe over there does? No.
Did I have to update something to Etsy every day? No. Do I have to table at every con that comes my way? No. Did I have to put something on social media every day? No. Do I need to have thousands of followers? Hell no. But, because I was told "you have to do this to be successful" I ended up juggling too much. I stretched myself too thin.
First, I had to recognize the people in my life who saw my stuff. I wasn't acknowledging them, and I needed to write their names down so I don't forget them. Write down who they are. Write down all the positive comments they've left me, all the nice things they say so I don't forget. Second, I had to edit down my work flow. The art I was making was taking way too long to do and it was extremely painful for me. There just weren't enough hours in the day.
Overall, I cut my production time to 1/10th the time it took to create a comic page by removing color. So, if you can, I highly recommend taking a step back and asking yourself "What does this art piece need to tell the core story?" And remove everything from your pipeline that gives you carpel tunnel and stress. But if you love doing a crowd scene, if it fills you with joy, leave it in there. You get to decide what stays and what goes and you can change your style at any time. You have complete control. Not your followers.
The other thing I did to help with burnout is that I edited down my social media like a lot. I only use twitter and tumblr now because my other socials just weren't working. That, and now I mostly ignore trending hashtags. They take too long to do and they're too stressful for me--no more inktober, no more mermay, no more -sonas...it's not necessary and brings me no followers.
Also, I keep track of projects using Asana to keep me on schedule, and I aim to accomplish at least 3 tasks a day (I've made the tasks pretty small so I usually accomplish like 6). It's very rewarding to click the "done" button. Highly recommend Asana to break projects down, it's a little weird to figure out at first but once you do, it's WONDERFUL and helps me from feeling overwhelmed.
And, most importantly, I had to get hobbies that 1.) don't make any money 2.) don't require any social media presence 3.) don't give me carpal tunnel and 4.) have nothing to do with art. So, I blog about anime like once a week with my little brother in a very small corner of the internet where no one is watching. I cannot even begin to tell you how relaxing it is to have a blog where I don't worry about other people's expectations.
That being said, burnout is very serious. It has a very draining physical reaction, and being able to talk to a professional and get some help is just--there's nothing like getting that one on one help. You can come to your doctor about something as simple as burnout. I've done it. It's fine.
Anyway, that's what helped me, and everyone's burnout is very different, but remember that it is OK to slow down. Maybe the break isn't something you can do, I can understand that. But, it's OK to slow down, sometimes we think we're not pushing ourselves hard enough and we're actually doing a fine pace and can go even slower if need be. It's kind of like running a marathon. When you're going uphill it's OK to go a little slower.
Anyways I went long but I'm a wordy person, hopefully something I said was helpful.