Well, you don't list your power supply so its hard to answer your question. Also, without knowing what you want to use your computer for its another challenge to answer your question. If gaming, I would say your CPU. For 1080p gaming, an R5 3500 is not ideal. A R5 3600X at minimum and a 7000 series Ryzen or 12th/13th gen intel if you are up for replacing mobo and ram depending on mobo.
Edit: After the fact, I realize the random string of letters and numbers is a PSU. My initial comments stand.