The draft is pretty good. Only a few points to consider changing:

• That is an entry level Motherboard which may limit your upgrades in the future. It overheats with a 16 core ryzen 9.
• The ram size is good, but the speed and latencies are just as important nowadays. A 6000 MT/s CL30 Expo ram could improve CPU performance, but it’s a kind of OC so not every combination is fully stable at the highest speeds.
• Especially with competitive and indie games it’s easy to run them at high FPS. I would consider getting a 1440p high refresh rate (144+ Hz) monitor if you don’t have one already. It’s a huge upgrade coming from 1080p60Hz.

That’s more than enough. You can’t do any more.

As an Android flavour it should be safe after uninstalling all apps associated with the university. Did any of them need a “device owner” permission? That’s the only way to be more persistent on Android without root access.

The mobile and TV clients are often limited to the codecs with hardware acceleration. Or just selecting a lower bitrate on the client will cause transcoding.

There is an even more relevant video of using external storage trough USB. He recommends using software raid:

Can We Build a Home Server Out of Mini PCs?