Thank you all for your advice. If anyone is interested, this is my new list:
https://de.pcpartpicker.com/user/kablurk/saved/n6VyFT

I replaced the motherboard with a larger one (I didn’t even pay attention to the size before)
replaced the HDD with a second NVME SSD
replaced the PSU for one gold grade one (something else I didn’t know anything about)
and I replaced the RX 6500 XT with the RX 6600 (in return I’ll stick with the 16 GB)

Again, thank you all for your comments!

Black Flag has been on my bucket list for so long. This would be really cool.

Maybe they should look under water instead of under way…

Congrats. So you can fuck off now, right?