Hey CD, go do death to the dorgeshuun, (check spelling) that quest enables you to open chests in the H.A.M stronghold by lumbridge. Take in High alch if possible. Plenty of guides on youtube or PM me, i have more ideas than this . i just know that the chests under HAM is a good 300k an hour if you do it right.
If you are a pure and you love ranging. Camp lizardman shamans in the swamps near raids. Safespot them and get a Dragon Warhammer which is equivalent to 80-85mill. Drop rate is 1/5,000. Not as bad as you think but worth the camp. Who knows you could get one in less than 100 kills or be unlucky and get it within 10,000 kills. Test your luck and see if works out for you. 10-15 hrs of camping them can range from 1-3mill in loots per trip. You need any ingame advice just add me. Good luck!
"I don't steal, I just call it long-term borrowing"