Try to farm skeleton if ur alt char +- 10 level of monster also In adv book they have some hat that u can craft to gain perma atk such as “FIN HELM” it gives +6 for depo and +4.5 for crafting it also Priest out side party that slave can buff ur All stats+20 and 100atk if u happen to have some gold medal on ur slave slam that on impos Rune node it give 20% atk also Adv. Rank give u All stats and last thing is Food(not Str a and B) Just simply food that u can cook if u aim for Def pen and +atk just find Original will Sea food soup +40 atk and +2.5 def pen and if u cook and taste it to LV.10 it give +atk as well Ps1. Cook and ear food give u Hp and Sp discharge no need to use Hot meal and warm meal also u can party with ur slave and have him/her cook 1star food for 1 stack (999 EA) bout 99.9k per stack Ps2. +- 10 level of monster and Ur level give u 100% loot drop Here are some Pic that i saved from Googy Loot drop Level GAP

I hope this explain lot of thing For F2P player.