hey guys im stuck any help wud b lifesaver!

i am level 15 on sentinel island and i cannot find a way to level up to face level 18 bosses in the temple after u ger sassana's ring.

is there any way to level up quickly?

any place to go or something to do?

if those guys are level 18 then it makes sense for me to be level 18.

also i could not guys to wake up in the valley (3 sleepers) and chapel priest in broken valley told me to explore citadel tower but i could not find it.

im really stuck guys i wud really appreciate any help