Hey scine i cant kill green dragons on runescape i cant make gold any more please help me?

ok my combat Level is 78 my attack is 71 my strength is Level 60 my def level is 60 my magic is 51 my range 34 my fishing 56 my smithing 49 my mining 57 my cooking 56 my rune crafting levle 24 and i my slayer 24 and my hunting is levle 21 but i am really looking for something in the killing things catagory i am looking to get full dragon soon and cant afford it and please not i do not cheet and i am a mem so do not tell me any thing like big bones