I’m level 75 and i did all the side quest and main quest i could find in Royal Moesoleum 1F and 2F. i did Gytis settlement Area already.
yeah unfortunately you need to grind at the royal until you are around 86~ otherwise you could try other zones for quest’s to level up if you can handle the monsters
This might help,
Whats the maximum lvl difference admited to take quests? 10 lvls?