Alright, straight to the point.

Right now with the changes you've made the current SP gain scales with your rank, ex. you get more SP the lower rank you are, balancing out at rank 24. This goes along with your concept of the first 20 ranks working as a tutorial of sorts.

Now, what I am proposing is to extend this trend to the guildleve issuing conditions as well. What I basically mean is that for each camp up to rank 20, you can be issued more than eight guildleves per 36 hours, or alternatively make the conditions camp-specific for those rank ranges, as in you could get 8 leves for rank 1 camps, 8 leves for rank 10 camps, and so on. The philosophy here is: Firstly, it is unreasonable to expect that a new player could easily pick up and understand the concept of guildleves (that is a new system to many) and that they are meant to be done together by sharing the leves you have in your possession. Thus players, at the early ranks, will simply solo their leves (which should be expected of them, since you can't make them group up immediately after being thrown into the world) and then once the eight leves are up they are left with nothing to do for 36 minus X hours.

Further, since the rewards are so generous it would not be unreasonable to lower the amount of SP and money gained a bit to keep in line with the developers intended leveling speed. The point here, in the end, is to offer the player a "lite" version of the current system that a) would teach you how to progress in the future and b) does not punish ignorance by locking people out of leves simply because they didn't know they should have shared them with each other. They are low rank players, they won't grasp everything immediately and thus it should be taught to them over-time and not all at once.

In XI, you could solo up to level 10-15 and only then were you expected to start grouping up in Valkurm Dunes. You could party before that, but it was voluntary.

Either way, the problem right now is that too much is expected of the player at the beginning of the game, and not enough is explained to them. If you want us to do the content in the way you intended, in my opinion you a) should tell the player what is expected of them and how it is done, and b) should give him some leeway at the start of the game, which you have been doing. Now it simply needs to be extended to every major gameplay feature you have in place and planned.

Lastly, after rank 20 and having taught the player what to do and how to do it, you can go back to normal 8 leves per 36 hours per person standard, and let the players work together to do just as many leves as they want to.

Surely this is not the only change that the system needs, but it is a much needed one.