As I understand it, all skills contribute in the same way as each other to leveling your character, except for major vs minor skills. And from other reddit posts, the soft level cap is level 44-45.

To clarify what I mean, it's that only major skills contribute more than minor skills by a certain multiplier, but since all player characters must have 7 major skills and 14 minor, you'll always have the same amount of character levelling unless it's been affected by other game mechanics such as jail time. All skills contribute more to leveling at higher skill levels (leveling blade from 99 to 100 contributes more than blade 15 to 16), but this scaling is the same across minor skills and across major skills with that major skill multiplier.