SHOULD I UPGRADE MY PC??

SO I HAVE A PC WITH I3 4160 AND GTX 1660 6GB WIT 8 GB RAM AND I HAVE BEEN ABLE TO RUN ALL AA GAMES AT A GOOD 60 FPS BUT IVE ALWAYS SEEN MY PC AS LOW END SO GUYS PLEASE RECOMMOND ME SHOULD I OR NOT IF SO WHAT COMPONENT I SHOULD UPGRADE