It's very simple

You can cap in 1-2 day actually...Since it seems you have access to plats do this:

1. Buy a 7 day exp elixir and abbadon pet if you can.
2. Go to WT in travelers outpost complete all the maps to WT4
3. Ask for a party.
4. Run it multiple times till you are 35.
5. Complete all the missions and access shuyal campaign complete it then run the last map on shuyal until you cap