If you intend to win a freeroll, then, due to unusual opponents, your strategy should be as follows: tight, solid, aggressive poker.
Play only good starting
hands.
Make big raises and big bets more than in normal play.
If you have a good combination, put, put and put it again.
If you have nothing, well, there's nothing to be done. Do not try to
bluff.
That's basically it. We are waiting for a good map and forward. If we consider the freeroll in more detail, then it is necessary to note the presence of three stages:
Early stage: the stack sizes are quite large compared to the blinds. You have more than 25 big blinds.
Late stage: the blinds have grown significantly. The size of your stack fell below the level of 25 big blinds.
Final table: the decisive stage. You have reached the last table.