A THREAD FOR NEWCOMERS!

Hey guys! I hope I'm posting in the right section. I'm not a very experienced player. I'm still learning. I'm currently trying to beat a map S for Fortress at 200% difficulty, 7 players, 1 vs all. And I haven't been able to win for 3 weeks. The furthest I get is day 3, and then I lose on day 7. Maybe someone would be willing to play the scenario and record a video? I would be very grateful. I just can't seem to figure it out.