You only mention your laptop is running out of space so you need to get a new computer? does your laptop have a soldered SSD? If that’s not the case, I think the reflex should first be to see what storage you can get your laptop so that you can keep using it rather than discarding it :(
Same boat, fedora + kde, solid experience all around. Love Fedora and really enjoying KDE, though im facing some minor gripe on my laptop with the power management which always seems to kick in max performance when plugged in despite all possible tweaks I have tried (tlp, powertop and the native power management settings).