How do you have 30,000 supply? The 10 of you together shouldn't have that much...
I think you need to explain what you mean by that. However, if you're just starting a normal 9v1, the only thing you can do is turtle, then pop out one planet at a time. Rush out to 2 chokepoints that can defend your entire empire. Depending on the map, this may mean only having 2 or 3 planets. Quickly build repair stations and a starbase. Wait for their fleet to attack. After killing an invading fleet, push out one planet and take it over. Build starbase and repair stations. Rinse and repeat. I'm fairly certain this is the only way to defend yourself against 9 unfairs. Even this will require some map luck, though it is possible. Once you have a sizable chunk of the universe, the dominoes fall faster, and you can be a lot more lenient in your defenses.
