Orrrrrr, ask the developers of the game that we're paying for to make a game with a realistic level of challenge.
Your solution can't be that every person that buys the game that is a fan of City, Liverpool, Chelsea, Utd, Arsenal, Spurs, Milan, Juve, Inter, Roma, Napoli, Barcelona, Real, Atletico etc., should not play as their favourite team and should instead play as some non-league team?
And on the odd occasion I have managed smaller teams, you just fly through the leagues with back-to-back-to-promotions. It's still not a challenge, it's just delaying the inevitable.