Do Trakanon's Teeth. Start with the ones on the outskirts of the ruins of the city, and when they get too low you can instead do the ones closer to the Sebilis entrance.
In the ruins outskirts you can afk inside the corners of the outer walls (but definitely test to make sure you have the right place). Closer to Sebilis -1700, -5200 is a confirmed safe afk spot, as per
https://wiki.project1999.com/Per-Level_Hunting_Guide
Alternatively at lower level you can also do the graveyard mobs in that zone, and there are afk safe spots against the wall on either side of the graveyard.