I’ve tried a couple different KDE distros and settled on Fedora 40 KDE spin. It seems to be the most complete KDE experience without all of the Canonical/snap bloat. It works great on my Thinkpad. Also runs decent on my gaming desktop using the latest Nvidia beta driver - I used to get stutters and artifacts in games/steam/plex and now with the beta driver those apps run fine
I’m not all to familiar with the iso layouts. Non of my model Ms have wire stabilizer for any key other than spacebar.
Maybe your enter key is using a wire stabilizer and the wire is missing. Check the bottom of your enter key and see which type of stabilization it is using (geekhack.org/index.php?action=dlattach;topic=5500…). If it is using the wire and it’s missing or damaged, you can probably take the wire from the plus key and use it for enter
Each keycap has one spring. The larger keys have a stabilizer (the blue insert). From your picture, it looks like you have all the springs. You’ll just need a blue insert for enter key, + key, and numpad enter key.
You may be able to find someone selling the stabilizer inserts on ebay for cheap. In the meantime, you can move the blue insert from numpad zero to the enter key if you use enter key more often.