The problems I'm having is with actually adding terrain, especially in the eastern continent. I also wasn't keen on the southernmost part of the eastern continent so I found a bit of Eritrea that I liked and used that instead, and so I've ended up with something like this: I'd found someone on Reddit that had combined all Celtic nations into one big landmass, so being from one of these nations myself I thought it'd be a nice little easter egg for my friends. I'd decided that since we were playing on the eastern continent that I'd just work on that first worldbuilding-wise and come back to the western one later, but I just wasn't keen on the Western one so ended up replacing it.
So to start off with, I'd found Azgaar's Fantasy Map Generator and decided to take whatever it gave me, because in the real world people don't get to choose their geography so I should just work with what I've got! So my initial continents looked like this:
I've been working on the world for my homebrew D&D campaign on and off for a little while now and since I've hit a rut I figured I'd stop just looking at maps here for inspiration and actually come to ask for help.