How do I get my Avg. CLF % to go up? it keeps going down no matter what I do
Carry more cargo, or supply less and carry the same.
But really, need more info. What are you doing that's seeing it go down? Are you using freighters, or is it belly cargo on pax planes? Is it because most of your routes only have cargo demand in one direction?
More importantly, LF doesn't actually matter for anything. Are your cargo routes profitable, enough to pay for overhead? Is your cargo split on routes meeting the actual demand? If so, then a low LF is irrelevant.