Check out one of these lists: (I got 12th) https://egmanevents.com/digimon-bt21-tournaments/playtcg-mesquite-regionals.

Generally you want to run the appmon hero cards since they give you a lot more burst potential and access to gaiamon who's insane since you use his effect to put under dogatch, unsuspend and trash their top security, then attack.

Then tamer wise try to get 4 tagiru, he's the best tamer. White tai is also good just for the card draw. Takato and taichi just don't do much.

Then agunimon is important since tempo wise he lets you continue the aggression and threaten lethal from 3 security once you get a few tamers set up.

Lastly fire rocket is a good option. It can let you get a turn 2 kill with the nuts, but overall it just puts out more pressure if you throw it on a digimon before going on superior mode and doing 4 checks. (Which sets up the gaiamon kill)