Level Sync made creating parties much easier in several ways. You never had to worry about out leveling your friends and thereby hurting their EXP. It also allowed one to party on a monster of any level, provided one could find someone of the appropriate level to sync to.
The problem now is that with the sustantial boost to EXP, a party can level up so quickly that they can become too powerful for a camp in a short amount of time.
Another problem is that one might not be able to find an appropriate level sync designee for a good camp.
The solution is to allow players to adjust their own levels. The restriction would be that players can only set their level down to any level they have achieved.
For example, a level 90 Bard could set their level down to level 55 for the popular Wajaom Woodlands Colibri camps. However, a Monk with a maximum level of 55 could not set their level to 75, as they have not achieved the higher level yet.
A book that can be summoned anywhere, similar to the Magian Spectacles, could be used as an interface.
This would also help Magian Trials, as sometimes a player is too high level to gain points on a target monster.