What can i do at max level excluding dungeons/raid/trials?

[Jojoya]

Again I will say this to you, must be nice being new to the game.

I'm not new to the game but I never lack for things to do when I log in.

It comes down to what interests a player personally. The more narrow your content interest is, the harder it will be to find something to do unless your specific content interest just had a new release.