In short, it means you didn't put in enough effort.
Basically, what are you trying to say?
The point is, he just doesn't have any motivation.
Basically, you just haven't tried hard enough.
結局 means 'in the end' or 'after all', focusing on the final outcome, while 要は focuses on distilling the core point rather than a chronological conclusion.
From 要 (よう, 'essential point') + topic particle は. The phrase literally means 'as for the essential point', and it developed into a fixed adverbial expression.