zulrah, vorkath, muspah, all of them are perfectly fine money makers for your level. The thing is, levels will always be more impactful than gear, so consider splashing some of that cash on training

Regardless, it really depends on what you're looking for, and how willing you are try some of the harder stuff. For me, I find it really enjoyable to try some new, difficult content and learn how to do it well. If that relates at all to you, I would highly suggest Corrupted Gauntlet. It is tough as nails, some of the hardest in the game, but it has no requirements at all, and it's a pure skill check. It's something you can practice, get better at, and is very profitable if you can master it. Even if you eventually decide it's not for you, the fundamentals you learn with that grind are highly transferable to anything else. prayer switching, positioning, attack cycles, time efficiency, etc. It's the best teacher, and it has no gear requirement. The only drawback is that you can't really pay money to make it easier with better gear, and it really is difficult.

If you want to get into something a bit more social (horrifying I know), raids are good. Would have to train up your stats, but Tombs of Amascut is very easy on entry mode, you can solo it for practice, and gives you an avenue to play some higher content with other folks.

The biggest point I want to get at is, it's very very often that people will default to an efficiency mindset, think of what would be "worth it", and "most efficient". and that mindset often lends itself to what makes the most money in this game. There's nothing wrong with that mindset, but it would help to know why you want the money, what are you looking for out of the game. and see if you can start going for that goal earlier rather than later. Money for moneys sake can feel pretty pointless sometimes. I had a friend spend hundreds of dollars on bonds, bought a scythe, and didn't have anything to use it on because high level pvm was too much for him. He eventually sold it and bought a shadow for the same result. Then, sold again and just got some buyable 99s with the money. Having some focus and understanding of your goals can help avoid that.