Frost dragons? Train your slayer?
A lot of combat possibilities.
You could always buy some GP. Or learn how to merchant, it's fast and easy cash after you've learned how to do it.
You could also do some Green Dragon bot killing, very profitable, even if you only loot the Green Dragonhides and Dragon Bones. At your level I'd say it's basically Green Dragon killing, but triple the speed.
get 99 slayer and 99 def along with it, wil also make you some good $$$
Do more mining with gold ores, get 99 smithing with the ores and sell the bars. That would be free 99 smithing and some cash in return. You can also use the gold bars and buy some gems to get 99 crafting aswell.
Get 99 wc
What's the gp wise gain part?

