Most of your connections should be safe because of TLS. If you want to be 100% certain, use DNS over HTTPS.

It’s enough for 1080p. The bitrates offered by YT and most streaming services are garbage anyways.

For downloading large files, such a low bandwidth is a pita.

Unless your upload bandwidth is total horseshit, set up a VPN connection to your home router. If the connection gets blocked, try different ports. TCP port 443 usually works (although TCP is not ideal for OpenVPN).