I use Deemon for automatic music downloading from Deezer (free). Then I stream my music with Navidrome and some Subsonic compatible apps for mobile. I have this setup for over 3 years now and I have 3TB of music ;)
If you just want to download the songs you need, you can use Deemix (I use this Docker image, you can just install it as an application too)
Tip: if you don't want to setup a music server, you can use Syncthing to sync you music and playlists between devices :)
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What software do you use for the thin client part? I'm really happy with Moonlight, just Wayland support (no cursor) is a little broken.
A few months ago I bought a second hand Nvidia Shield TV (€40), flashed LineageOS on it. Very happy with the device, especially the performance.
I use Jellyfin, SmartTubeNext and some VOD TV apps from my country. I've Adguard Home on my Proxmox server (can also be a Raspberry Pi) that I use for DNS adblocking, so we can watch VOD TV without any ads. Works really well :)
We've switched to this from cable TV and my family loves it, we can watch anything we want without any ads and FREE!
Only problem (not for me) is that Netflix doesn't work on it without GAPPS.
I use PairDrop allot for sending peer to peer files/text to other PC's on other networks. FOSS and can be self hosted ;)
I use deemon to download my music from Deezer (free account only supports 128kb/s, this is enough for me though).
For the music server I tried both Jellyfin with the Finamp app and Navidrome with the Tempo app on Android.
For desktop app for both I use SonixD/Feishin (crossplatform)
Both where fantastic solutions but I stuck with Navidrome as it was easier to share playlists. (As an URL for non registered users or as public playlist for all registered users)
My setup is as following: Hypervisor: Proxmox VE NAS: TrueNAS Scale (where all music is stored)
1 LXC container with Deemon installed that downloads music in mounted NFS share from TrueNAS
1 VM with Navidrome installed in Docker with the music folder mounted with NFS
You don't have to use such a setup, you can perfectly do this on your existing PC with Windows, MacOS or Linux with DE. Or server OS like Linux with CLI, OpenMediaVault, TrueNAS Scale or unRAID