Yeah. I search out invasions and fly from boss to boss.
Preface this with the knowledge I am totally new and started playing about 2-3 weeks ago. So I know nothing really about the finer aspects of WoW. So...I bought an heirloom once but it turned out to be only for lvling up to 60 (i bought it at lvl75 or so.) Complete waste. Maybe I'll buy the upgrade but it ain't cheap and I was saving to get faster flying training.
I do the daily Enlightenment to get my XP boost but I know nothing about potions. Any suggestions?
First of all, save up for flying because that is something you must have and buying any heirlooms when you're already 93 means nothing, you'll save little time but flying is something that will serve you the entire time
There are 2 more ways to boost your exp -
Elixir of the Rpiad Mind and
Excess Potion of Accelerated Learning
The first provides a 300% boost to experience but also costs a ton of gold and does not persists through death, so you shouldn't really consider it at this point
The second one you should definitely get if you are planning on doing anything in Draenor, it lasts through death and gives you bonus exp for anything you do in Draenor including the bonus objectives which give a ton of exp
Aside from that, the heirloom you paid for will probably pay off down the road when you level up another character so don't feel too bad about it