If it's not fun, and it's low-key harming your mental well-being: STEP AWAY FROM IT
People have stepped away from more important things like careers! They get an incredible amount of stress put on them and decide NO MORE, their health suffers, their mental health suffers, it's not worth a great paycheck if you're ill and cannot work in any capacity.
This story is not paying your bills, you don't have to go through with it, you have no obligation to engage in this thing that is sucking the joy from you.
Currently you're enamored with the idea of what it could be, but without a solid plan, it could become anything, it could even turn into something you hate.
You say your original idea was to make it a successor to Bionicle. But first you have to identify what made Bionicle so great, what it did to resonate with people, with YOU. Don't start with drawing, start with plotting and writing. Make an outline or write out little scenes, see if it captures YOUR interest. Don't think about what other people will say about it.
Personally I don't put any pressure on myself except to finish a story once it's started and there's a lot of engagement. But still I'm pretty lax about it. If I'm not feeling well, yeah I'll miss some updates. Or if I truly come to hate it, I might drop it (hasn't happened yet). I'm not contracted with another party to produce this stuff.
Also I know none of the things I create will be perfect. And I don't view any of them as a masterpiece. They're just fun things I indulge in. I'll always have more ideas. Some fizzle out, some stay on the back-burner forever, some get enough creative inspiration to spur me into actualizing them into a comic or novel for others to see. I've only got so much time on this earth, I have to prioritize things that I know I can realistically accomplish without compromising my health or sanity.