as stated above. the game is a grind, which it seems you are ok with, but there is also resource management. Resource management tends to be the harder part as you start to move up in the early -> mid game.
Set up for the marathon, and pace yourself the only way to get there fast is to $$ and the only way to stay flexible without $$ is to hoard and make smart choices. There are several gear "humps" you dont need everyone to get through each hump all at the same time. get the ones you need through it and the rest will follow.