I suggest woodcutting! It might take long but it makes good money if you are chopping Yews for F2Ps and Magics for P2Ps! Also I suggest Runecrafting for P2Ps! You can craft runes like death runes, law runes, cosmic runes etc. Death runes, Blood runes, Mud runes and other runes that only are for sale to P2Ps (EXCEPT FOR DEATHS) Shops.