I am not an expert by any means , but here are a few things that may or may not be your problemwhat is your probe count ? If you are spending a lot of supply on probes you have less for army and you are banking more than you need . Do you have all of your upgrades requires gas too . As unassunnova mentioned , don ' t wait until 200200 to fight . If you skirmish with smaller armies at a time you can pressure the opponent and if you lose your cheap units like zealots you can just build them back with your floating minerals of course . Also you may want to look into your army comp at this time . If you have 200200 of just gateway units , perhaps add some more of those expensive units to round out your army . if you have 200200 and a great army comp , make sure you have enough building structures to rebuild it all . multiple robos and stargates are great , depending on your strategy . if you are in a great spot , using probes to build cannons are great too because it protects you a bit from drops and base trade situations .