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€?
I think upgrading the RAM as you mentioned is going to make a big difference. While the physical RAM might be soldered to the motherboard, you could buy a fairly cheap SD card or USB and set the system up to use that as virtual memory. It won't be as fast as actual RAM but it might help and large SD cards are honestly really cheap these days.