Standard behavior is once skill reach 100, all other skills are capped to 95, but is your best skill is not 100, its 96-99, you can still improve all skills to 100, expect 2 primary skills, which are limited to 99..
So if you want to reach 95+ in other skills, you have to avoid to using, increase best skill to 100.. I can of skills like running or jumping or even magic is complicated, yes can cheat a edit value in save file, but is annoying.. So alternative "cheat" / enhancement would be nice. Player really not know how its working that he should avoid to reach 100 value.. until he starts to google it..
Details:
https://en.uesp.net/wiki/Daggerfall:Lev ... _Level_Cap
Under normal circumstances, when a Primary skill reaches 100, no other skills may be leveled above 95. With care, you can increase every non-Primary skill to 100, the three Primaries to 99, and then finally choose one to reach 100.
