They turned some of the older zones (Altgard/Verteron I believe but dont quote me) into a streamlined leveling experience, You should be able to go to your factions area and do quests to level up as you go from area to area in that zone. There is also currently an anniversary event going on where just sitting in the zone gives 750,000xp every minute which could be another option. To supplement that I would do the daily luna instance as well as that gives a decent chunk of xp at the end. If you can progress through all that and get to 81 you can work on the kerub quests which will give you a set of gear to use and should be good enough for you to do the event instance Garden of Growth which will be in the major hub city for your faction (Gelkmaros or Inggison) and gives a good amount of xp and should be enough to get you to or close to 85 over the course of the event. Hopefully this helps and here are links to the events if that helps too.
https://www.aiononline.com/en-us/news/14th-Anniversary-Event-2023
https://www.aiononline.com/en-us/news/garden-of-growth-october-2023