If you have the max attendance, you don’t need to drop the price. In that case, you can move the price up to check if you still get the max attendance. To get the maximum out of your stadium, find the highest price that gives you the maximum attendance.

Also, if you are on the lower levels, there is a maximum attendance you can get at a certain level, regardless the size of your stadium. You will get the 5% bonus if you get this attendance, also if your stadium has more capacity.