Oh I work basically solo. Though Witch Hat uses a lot of pre made asses from RPG Maker and I get some tilesets from forums. I also did "hire" a friend to make the title art since I suck at topography, and some people help playtest and check for typos, but most of the help I get is from the player actually.
With my next game (Spirit Arrow) I'm using an engine that actually requires me to write code (Game Maker Studio 2) so I'm learning everything from zero, and all the visuals are hand drawn. The only help I'm getting is from tutorials online and free sound assets, and I'm probably getting the same guy to draw the title art again but that's it. So yeah, no wonder it's taking so long xD