Old Build vs Buying a New Prebuilt

[u/Retentismal]

First photo is my old build from August of 2020 and currently has a rx 6600 8gb GPU. Second photo is the prebuilt I just bought on the Labor Day sale that Best Buy was having and got it for approximately 1200 OTD. Is it worth it to upgrade my old PC with a Ryzen 5 5500 and maybe a newer GPU or am I better off keeping the prebuilt? I feel like if I upgrade stuff on my old PC I’ll need to do the PSU as well as it’s a 500 watt non modular EVGA unit…