Returning Player Help
Well to be honest, times change and ways to level shift with them. I have always been a fan of map completion / story questing, but I haven’t leveled in so long I think there is better ways. If you pvp (even just do dailies for pvp pots) you can stack up the books of level up. Another way is crafting.. that is not cheap these days. There is EotM if you can find a good karma/xp train.
Make sure which ever way you pick, you use food and oils for xp bonuses and any other bufffs you have. Look for a guild as they can offer xp buffs as well.
Welcome back to gw2, and if you have questions/need help look for me in game.