It would be helpful if you would post your stats and cash..
1. merch (such as flipping)
2. Slayer tasks if high enough
3. farming is always good money
4. Green drags are really over-populated but would make you cash.
That is the thing; you should get up those skills. Money isn't just going to magically pop up on your account. The only way you're going to make something is by training up or if you really dislike skilling try getting into some merching.
Fishing is actually great money once you hit 90ish, before that fly fish a bit for decent exp.
Farm herbs, or use this guide on the forum:
Heres the link: http://sythe.org/showthread.php?t=937442 (its not my thread its just a really good money making way).