endgame is pretty broad in grim dawn. Its like anything from doing steps of torment or ancient monster totems in ultiamate to killing crate of entertainment boss, SR 75+ and crucible gladiator 150-170.
Here you can find tons of “budget” builds that can at least do some of the endgame content that Grim Dawn offers Beginner build guides Compendium (for AoM + FG expansions) see them as either “minimal versions” of builds or “stage 1 - endgame builds” something that you can improve on later on 
200h and 35 chars… try to focus on a few of them, or just one, and try to make them as good as they can be! If endgame was accessible to someone who does not know about how to make builds etc, then it would not be endgame.