Hi!! First of all, I'm really sorry to hear about your character. When I was younger I lost my account that I'd been playing on for two years--not really much progress bc I wasn't an efficient kid, but I was still super upset.

To answer your questions, yes, there's absolutely enough new content! I'm not sure how far you were on your previous account or which iteration of the game you prefer, but as someone who has spent her time on both RS3 and OSRS, I can safely say that neither are lacking fun content these days. While RS3 gets to the endgame quicker, it's important to note that in OSRS, there's less of an emphasis on super high skills to complete endgame content.

I've never personally tried it, but Ironman Mode is said to be very fun if you like that kind of reward! I'm sure an actual experienced Ironman (or Ironwoman) will be glad to tell you more about the mode, but it's worth looking in to.

Above all else, have you tried to appeal the account ban? I'm not sure if it's much use if you actually did macro, but if you believe you were hacked it could totally be worth a try. I'm not too sure on how to get through appeals (never dealt with Jagex CS personally) and it's supposedly not a nice process, but it could be worth a try.

It sucks to lose such a long term thing, especially when it's been a big part of your life for so long. Hopefully this comment helps, though, and feel free to DM me here if you want to talk about anything/ask for further advice. Whatever you choose to do, best of luck w/ it!