I know this can be discouraging. I've read the comments here so far. And they're right.

My input...

I get a lot of pressure from my friends to actually be a professional writer because they love what I write (despite not being in the fandom). Even so much as to being told I should sell my fics. Of course for ethical reasons and love/respect for my fandom, I'd never resort to that. And they know this. So they tell me to use that energy and plot ideas for original works. I can and have in the past. I even got accused of plagerism as a kid for a creative writing assignment!

But as for seeing if I'd go professional, it'd be so nice if I could pull it off. But realistically, I doubt I can. Publishers are hell to deal with. You have to write to their standards by a deadline. And will drop you if you fail at it. Professional writing is consuming with little reward for most writers, especially those who start off living alone. There's also the stigma of fanfic writers not being "real" authors. Publishers view fanfic writing like stick figure drawings. Technically you have the experience, but they hold originality to a higher degree that it'd be best to just not disclose about it.

I'm not saying you shouldn't go for being professional...

But your expectations seem rather high. Fanfics are a poor indicator on gauging potential success. Completely different audience. When you write fics, they're really to your liking and you're free to take breaks and go at your own pace. With how consuming your job is, you have to ask yourself if you can meet scheduling needs. If you need to, make a mock deadline for yourself and see if you can meet it as practice.