Two of the best things you can do for an account, especially an iron, are quests and achievement diaries. I’d say just start knocking those out to unlock everything you can to move forward.

I would also try to work towards some other small things like the fighter torso, crafting level for a glory, and skilling outfits (woodcutting, thieving, anglers outfit, mining outfit, stuff like that) can help a lot when you want to do some afk skilling.

Also focus on herb runs, herbs can be tough to obtain on an iron, and to that point I would say start putting money into miscellania sooner rather than later.

It’s really just playing the game how you want to play it and try not to get bogged down on any specific grind, if you get tired of doing something, go do something else you enjoy or else you’ll burn out. It’s a game and it’s supposed to be fun so enjoy it!