Fellow self-publisher here.
I totally understand the feeling of not being able to work on a project with the same frequency for a long time.
I agree, the work never stops, it's not just the initial hype, but it's an ongoing effort to make every issue/episode/volume of your work outstanding!
I also know how exciting it would be to have a professional publisher and I too dream to see a printed copy of my work in the future.
I am definetly not an expert on this topic but my advice is to see the situation by all angles.
Considering contacting VIZ or any other studio you want to pitch your idea could be a good start!
Or at least, that's what I would do!
I'd ask for more details to see how much time it would take me every day/week/month and if pitching a project would actually be worth it (including how much artists would earn from it).
Maybe, after you get a few pages done it could become your main and only job!
Also publishers can assist you with the talent of other artists who will worry about backgrounds, writing, inking, coloring, even lettering!
See if once you are in the work environment needed, you will be able to completely avoid crunch (it's important)!
Like OP already said, nobody is trying to convince anybody to do anything. But be informed!
About the "I don't believe in myself" part: I definetly am not competent enough to tell you what to do... but again, try to see the situation from all angles and perspectives.
Ask yourself: "What can I do about it?", "Is this a rational way of thinking?", "Is this useful or is it damaging?", "If I need it, how can I get help?" and, finally, "It is hard to try and fix this, but is it worth it?". I already know the answer to the last one. It is "yes, absolutely"! 
Hope this was helpful! Happy creating!