Here's end-game is a nutshell for us all.

You either:

1. Spam WP and AK all day, all night long.
2. Coil and get pissed at people and take 50 years to get a group unless in FC.
3. Wait for Myth's to reset. So log in 1-2 days a week.
4. Craft. Which I like...but a lot of people don't. I normally do not fancy crafting.
5 Boringly FATE grind solo because the lower levels are dead. [For me at least.]
6. Relic aka get pissed at Titan and have a heart attack over him.

Sooo yeah. There is not much to do, no matter how you slice it.