20ish is a rough point for a monk, much like upper 40s. Just not much to do solo-wise that is practical.
I managed to do goblins in LOIO and avoided the shamans. Once I was 23 or so, I rotated between WW groups and sarnak fort. When I wasn't grouped, I was fear kiting mobs in LOIO near the lake by the FM zoneline choke point. I understand fear kiting does not work as well anymore though.. it was truly OP. Fear kited from 25 to 50 basically..
My roadmap looked something like this:
15-22 Oasis Orcs and DW Crocs
20-30 LOIO goblins, sarnak fort, Lake by FM zoneline
30-38 Split paw spires, SK birdhouse (harriers and avocets)
35-42 Solo guards in high keep omg so many xp once you learn it.
38-45 FM fort and soloing non casters around it. Gotta be real careful there
43-50 SolB noble camp, bats n bugs, GREAT solo spot is yeti cave in north east dreadlands KC side.
50-52 KC
[You must be logged in to view images. Log in or Register.] and solo hill giants for cash
Then i quit because i hate KC, that place brings the worst out in lots of people.