From 110 - 150, PVing is main levelling option. There's plenty of squads outside PV in East Arch, and that's not a difficult option. It's not difficult if you know what to do, and it takes much less time than PWI/Other Private Servers...
Donation-wise, you can donate. But end-game is entirely farmable, if you know how to farm and do the right events.
Good luck!
If you need any help in-game, Dispose is always free. c: