I don't know what the current best money making ways were as I don't play rs3 anymore but when i did play, I always liked staking, comission staking, slayer with a spring cleaner as the guy said above me, great ways to get XP/Gold if you're account is high enough, and lastly I'd PVM BOSS solo or with my friends. I did used to be involved with a merch clan though it just got boring. All these methods unless Im mistaken are still pretty solid methods to this day. Granted you have a decent account.