The title says it all. If HF were to return after G2 Bionicle ends, what would you want to see it do differently from last time? This could be your chance to say how it could be better if you liked it or what you would want to see that would make you enjoy it if you didn't.
Also: please don't just say "I wouldn't want it to come back" or "more story", as those are vague.
I personally would want some more setting-building (developing the universe they live in) and another crisis of Breakout scale, such as perhaps a villain factory starting a war.
What about you? What would you want changed about Hero Factory?