Quite easy really, you got a strong squad at the low levels of the game, sell off the 2 4* players and buy 2 scouts that will be close to getting 7* at the beginning of next season.
IMO, Level 3 is the easiest Level in the whole game, lots of abandoned Level 1 teams where people have started the game and just thought I wont play this game and these teams over the next 2/3 seasons make it to Level 3 before the teams are deleted by the game.