I made a club in official editor, started in English league in level 12. I gave my city 1 milion population, and attraction of 15.
For first season I averaged about 800 attendance, while other clubs in league got like 50. I achieved promotion to level 11. Then I edited population in FMRTE to 10 milion. Another thing i noticed, attraction was at 0 in FMRTE, so I swtiched it back to 15 (all other clubs have 0 still, even Barcelona, Real, etc.).
Now in season 2 I'm getting about 50 people at games, like attraction and population reseted to zero.  I tried to return population to 1 milion and attraction to 0 or even 20, but still very low attendance. What could be the problem and how could I fix it? I wouldn't want to restart the save.

Set your average, min and max attendence higher.

Set your average, min and max attendence higher.

 

Pretty much agree with this.  I think the city population and attraction level only serve as secondary attributes to calculating your attendance and the chances of getting major national/international games getting played in your stadium.   The city population acts as a rough cap on how large your attendance can grow, but I've never seen the attendance shrink to the extent that you've seen, BlackSonic.    I take it your team isn't having any performance issues right now?