strategies to free games, there are thousands, but you should be focused on following them, otherwise it will be a waste of time trying to apply them in your game
If you're a frustrated player playing freeroll tournaments, you might want to rethink what strategy you use (if you use strategy), there are plenty of good players in the middle of those giant freeroll tournaments fields, but we should agree that at least 70% of the field is made up of medium and mediocre players and it is exactly with this type of player that you should be VERY careful, but you ask me why you take so much care and then I will explain.
These bad / average players are mostly playing just by playing and as they do not pay a buy-in to play they end up playing several hands and are constantly going all in, in the initial phase there is not much secret to play, their range of hands must be very tight, have patience, wait a monster hand and go all in, if you have AA, KK, QQ, AK, avoid bleffs, because they are very unsuccessful, tournament start
bluff does not pass, you always go take a turn, avoid limp, but understand the word "avoid", there are times you can use limp, but still, avoid.
In theory it is very simple, apply it that becomes difficult, in most cases, we fall from a tournament for several factors, error-impatience-haste-discouragement-
I always advise to try to get as much information as possible from your opponent, do not rush, your best hand will reach, and you will be able to raise your stack, know that when you bluff, someone can be NUTS, so avoid making unnecessary plays too often.
good luck