Looking for upgrade recommendations

Looking to finally upgrade my PC and need help on deciding what to buy. My budget is around $800 and my current specifications are:
CPU i5-10400F — 6c/12t

GPU GTX 1650 Super 4GB

RAM 16GB (2×8GB) DDR4-3200

SSD Crucial P3 2TB

HDD Seagate 1TB

Platform Alienware Aurora R11 / Z490
PSU 550W

I know from previous conversation that the PSU is a major issue, however as of right now i do not see myself replacing it, so is there any alternatives for upgrades that will be compatible and fit inside the shell of the R11? 1080P res is fine. I reside in America. is my best bet upgrading piece by piece or scrapping it all and finding a better build. I am fine with prebuilt or making my own.