The only way to increase add-on traffic is to add further AI airlines packages to the ones you already installed.
Like I did with PAI. Installed
ALL the packages they put online and then removed the default liner traffic, and now have all the FS world served by regular airlines, and default GA and historical flights.

If you can do the same, then do it. Though a long task to add manually all the packages, the end results are very pleasant.
There's but one real cure for human stupidity. It's called DEATH.
At the moment mourning the assassination of sarcasm and irony for the good of the "higher".
Proud FSIX user. Active user of FS98, X-plane and novic