The songs already listed seem pretty good to me
But one thing I reckon is important to think about. It's easy to just go LEARN a song, but once you've learned it, you're kinda still just facelessly copying the original line. Once you've learned a song, then try thinking about how to IMPROVE upon it
There's too many shitty basslines out there which just strum root notes. Try adding some colour into those! I'm not talking about writing a whole new line or anything like that. Just add in some fills or some slides or whatever the hell you want, it doesn't matter! As long as every song you play still retains part of YOU and what YOU do!
Once you start to get good at doing your own thing, you'll start finding general improvisation much more natural and fluid, and you might even develop some kinda signature style or sound. DEFINITELY find a drummer to play with if you can ^_^ if you do, just remember to follow the Kick Drum and you should be fine

GOODLUCK MY FRIEND!