Comments - ThorusGER

Spam Devastator Marines and Sternguard/Vanguard Units until you get terminators.

Eco is painfully slow, albeit you can stockpile energy and use it for power dumps if you are in dire need of req around tier 3.

Also spam like 3-4 scouts minimum and capture all points you can. You don't need to build a listening post on all of them, but the extra req will be useful.

What pop setting did you choose in the start screen? It sounds like you have set the limit to 30 and chose a doctrine like Jerkakame wrote.