Runescape money making question?

How can I make money in Runescape? I am a member and I am willing to meet any skill/quest requirement. I want to know how people have like 300m in their banks. I know some people collected phats from RSC but some didnt. Anyway, just leave something with the skill requirement. And if it’s a monster with good drops, leave what combat is recommended and what type of combat should be used (range, melee, magic). One more thing, I don’t want something like: “Go collect cowhides from the cow pen and sell at 100 each”. I’m looking to make something close to 60-70mill.

I would go for dragon bones
Green drags are crowded with cannons but good cash either way
Just 400 bones sells for about 2.2m
You can also level up slayer for cave horrors with a rare drop of black masks requires some quests done
and abby demons drop whips like 4m
ice strykeworm drops staff of lights
Hope that helps

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