You seem to have configured timeshift to write to /boot. That directory probably is what is filling the file system. Timeshift probably should have a different location to save the images.
You also have a ton of vmlinuz images for fc38 (some are debug kernels) that seem obsolete and should be removed. Apparently because the names of those images are not stock fedora kernel names they were left behind during upgrades.
Additionally the rescue image is from 2021 and probably will not boot with the current libraries. It probably should be recreated. Instructions for that are in the solution here.