no, it will likely go down.
enthusiasm drops on its own, thats why after 1 game you can have an enthusiasm of 9, but the next day you may have an enthusiasm of 8.
if you play normal you will msot likely have lower enthusiasm next game then if you would have playing TIE.
Now i cant say exactly where your enthusiasm will be after 2 games of normal. But if you play normal tonight, and next saturday, you will probably be at 5-6 enthusiasm.
Not saying its exact, but likely considering the fact its a 1 league game week.