Great composers for classical violin?

Hi all, I’m just getting into classical music, and I’m hoping you can help me out. Can you suggest any classical composers or compositions for solo violin, duet of violins, or maybe a small section of strings? Here’s a little more on what I“m looking for:

So far, I’ve found the my favorite type of classical music is pieces either just for violin or for a small string seciton. I think that’s called chamber music? In any case I really prefer a few strings over a fulll orchestra, with a solo piano coming in second. Also—probably because I’m inexperienced and have no ear for subtlety yet—I appreciate violin pieces that are obviously difficult. I like Vivaldi’s “Four Seasons” though of course it’s a bit played out. I also like Bach’s “Partitias for Solo Violin” and his “2-Part Inventions.”

Any suggestions for great composers or compositions along those lines? Thanks!