I am running some services like Jellyfin, Radarr, QBittorrent, Jellyseerr and some others on my Raspberry Pi 4. The problem is that it is already struggling to run those, since it has only 2GB of RAM. I wish it was possible to do a RAM upgrade to the Raspberry Pi but the RAM is soldered to the motherboard. I don't want to buy another Raspberry Pi with more RAM because they are quite expensive and I don't want to have two of them. So can you recommend something for around or under 100€?
If you need more ram but not a lot of CPU a used thin client can work, i use a HP t630 since 6 months now with only nextcloud and storage, has 2 ddr4 slots and 2sata m.2(not Nvme) for Expansion. Again its a 4core Pre Ryzen AMD chip so don't expect any Wonders. https://www.parkytowers.me.uk/thin/hp/t630/ this is a good side for this and other thin Clients.
Edit: according to HP the idle Power consumption is ~12w
And that’s the problem right there. That’s 12w idle power. The computer is not going to idle all the time and power consumption will rise. If you are like me and live in a place with high cost of power this will add up. The raspberry pi will is at max 9w of power. That’s max. At idle it’s more likely to be around 3 but could be more if you have some usb drives plugged into it.
Maybe consider selling your pi2g and buying a pi4g or 8g.