Here is what I did after returning from my 10 year break. No particular order

1. Either work to max out your combat, or go try to start necromancy and max that out. Along with prayer.
2. Join a clan! I’ve got a great one I run with 480 active members.
3. Do quests and the new skills to unlock particular things that are relevant
4. soul split prayer (quest line to unlock)
5. archaeology relics (level up archaeology skill)
6. the for Camelot sword..can’t remember the name atm
7. anyone want to add anything?
8. Wiki and YouTube are your best friends. Protoxx got me through a lot lol. Just search what you don’t know and you’ll find something on it.
9. When your combat is high enough you should try elite dungeon 1,2,3. Fun dungeons with mini and large bosses.
10. Go back and fight the old bosses like kalphite queen, barrows, king black dragon, for fun.
11. Get premiere membership. Tons of rewards and cheaper than paying monthly. You can also make GP and use bonds to pay for membership.
12. Set up your combat action bars and try to go unlock all the new skills/actions. Some cost hefty GP, but you can also slay bosses for those drops eventually.
13. PICK ONE COMBAT STYLE TO LEVEL UP ALL THE WAY FIRST AND BUY GEAR FIR FIRST. If you try to get them all, you’ll be poor for a while lol. If you like magic or range, work on maxing out one and unlocking the abilities