What does it mean exactly, that the computer does not start? Does it throw a kernel panic? When the computer is starting, you could press Esc which would switch from the Fedora logo screen to a list of actions being performed and you could see whether some of the actions were failed or if the process stopped somewhere. If so, what is it?
What happens if in Grub you try selecting the older kernel? Does the computer work fine?
The bootfail.txtyou provided seems to me like an upgrade process, did you upgrade the computer before you started seeing the issue? Did the upgrades went fine?
There are also some wayland errors, are you running KDE Plasma on Wayland? Try to run it on xorg.
I have been running all kernels on three different machines (I use the updates-testing repository) and I have not experienced any kernel related issues but my machines are not an ASUS.