If you start first don't do all the 🔥 you want, just summon 2 furries. when i play mirror match and i start first, most of the times i start summoning beat and wiz or dyna and let recon and donpa in my hand waiting for my opponent to not waste their effects
If you go second and they don't have chalice or econ just swarm the board with your furries. Prioritize banishing the high level furries with your Dyna's effect
Play chalice and wall of disruption. In mirror match those two really help and try to get Wiz as soon as possible and always keep fur hire in your hand to negate counter move in mirror match if Wiz is on the board only go full force when ymthe timing is right. Hope this help
And you can also have many different counter cards like Canadia and Floodgate Traphole also helps a bit to stop to swarm to begin. You have a lot of counter card to play with there. Stop their opening flooder and you pretty much good.