Glam, is the true end game.. Always ~
Other then that you have your Extreme fights and savage content. If/when you clear the Savage portion of the current raid you could move on to Ultimate which is of even higher difficulty.
It all really depends on the order you level stuff, as others have said you could level other jobs, crafters and gatherers (take Advantage of the Ishgard Restoration xp) and also there are level 80 content like treasure maps.
You could of course go back and do older raids like coil, you do not need to be @ 80 for that however but it is still one of the best if not the best and is worth doing for the story tied to it

Regarding gear, that is always the case but we still have time to go before next expansion