terran user here

normally the evil plan i use to win is. i turtle by walling then i mass marine and marauders and medivac with few tanks for defense.

vs zerg i drop ship near their main base . stim pack around 10+ marine + marauders sapu the hive + got the medivac heal .

for protoss i go in their base. quickly aim the pylons giving energy to the gateways. then they no food + cant make units then when they come to defend . i send another troop enter from the front . usually it works. unless i vs a pro who mass troops faster than me and spams those defense cannons around their base lol