On src/config/Renewal.h, comment out the Renewal mechanics you want to deactivate (in this case, all of it).
On src/map/map.h, find #define MAX_LEVEL 150 and replace '150' with '255'.
On db/pre-re/exp.txt, edit the max base/job levels of each table to your preference. It's usually the first number for each group, just read the headers per table so you know which class group you're editing.
Ex: im attacking normal player with soul breaker without using edp skill my damage was 21k but when i uses edp skill now my soul breaker will decrease damage it will around from 14k the player item was high risk valk armor,asprika,2megs,sleipnir,cranial vshield,bhorn,gpipe,masquerade..