From my point of view, to level up skill, in general, faster is to spread out your grind into multiple skills rather than focusing on one. You need to plan out how you can achieve your specific skill lvl needed.
Lets take an example.
Prestige 1 needs 500 skill lvl.
- 100 lvl mining
- 100 lvl sword
- 100 lvl axe
- 100 lvl archery
- 100 lvl acro
Reaching by this is faster than going for Acro lvl 500 in one shot. Subsequently, once you reach higher level requirement, you will tend to do this as conpleting lvl 2500 woodcutting is just impossible, except you have infinite resources and of course, if you are not human.