Magic slayer and bosses for gph

I am currently f2p with about 38 mil bank. Haven't played in awhile. I'm a noob.

I've been high alching to level my magic and make some gold because I can do it afk and get back into the game.

What can I kill or do with high level magic in members to make a lot of gold? Any good bosses or slayer mobs to look for? I'm planning to push my magic to level 92 before I go members again.

Thanks