I work on it alone too and I kinda prefer that for my own stories and comics because I can be a little hectic in the way I work on the comic. I've had really nice fans offer to help out with the comic though, like I've had several people ask if they can do the flats, which is super sweet and I'm grateful for them but I declined every time, mainly because I don't do flats in my coloring process anyway but even if I did I would want to pay them for helping.
I wouldn't mind working with a writer sometime in the future though, I wouldn't mind being commissioned to draw a comic either. Although if I'm working with a writer the series has to be short, I'd want to finish it in like under a year or even less, I doubt I have the energy to work longer on a series that's not my own unless I'm connected with creating the story as well.