plaguebearer

Im going for 70 to 75 strength, ive got 66 atm. Where should i train? Ive got 70 def and attack and 67ish hitpoints (maybe). Ive been playing pest control lately but im getting bored with it even after taking a break to reach 70 fishing and cooking. Ive also just bought guthans, the healing ability is rather nice :) Any suggestions? :)