there should be a winstreak command (maybe /ws) to check your winstreak in a specific gamemode. If you use just /ws, it should display your winstreak in the game that you are currently in. However, there should be a feature where you can check your winstreak in other games such as eggwars solos (/ws eggwars_solos) or something along the lines of that. Also, in duels, your winstreak should be displayed on the board on the right if possible.
ali