When i first started it took me 10 months to get to 84. Be patient, this is not a quick progression game, at first.
After a while when u have good gear, all buffs and xp boosts u can get 80-84 in a matter of days.
Best xp spots that u can do are the elemental Zones. No adena there, but easy mobs with good xp.
Top xp spots are TOI/LOA but they will be too hard for u now.
U have 2 options.
1) Be patient and stay in elemental zones for few months.
2) Farm adena and exchange for powerlvl from ppl that farm LOA/TOI