If we re close to lv 5 at the end of act1 , its means you only have 5 more level till the end of the game. Its going to be very long to get it imo. Long like going from lv 13 druid to lv14 druid in baldurs gate (took half the game to take one level up).

If it's what it's takes to save the world, then the world doesn't deserves to be saved - Geralt