Hello there!
I´m not really sure on P2P about that but in general I´d say max Level for doing it solo. But if you ask around in the Capital or in your Guild someone might be able to help you!
Greetings!
It is sad, but true

At lvl 100 or 105 I could clean the gates, but freezing me ... very hard alone, because it a very low dps, or high mobs HP.
At Xadagan ( lvl 110+) the bag ( 30 ) slots , with 4 pockets full with potions at the items and full at quest items, need to manual dropping.
I can't buy bigger bag, although this is not a combat skill or att/def stats improvements.
The bank is either full with materials for crafting: low level to level up professions.
This leads to a kind of frustration.
With the mounts: as how I leveled the shop changed the content, but they aren't cheap, neither good.
The good part:
The quest line exp is meaningfully adjusted.
To much time to level up, but in a few weeks can be completed and usually there are enough Marks of Fate to complete those important quests, which can be completed, of course except the last map.
A suggestion?
Somehow should be a bigger bag from lvl 105.