Looking for coach. Toss, can't seem to break into silver.

Hi, I'm a rank 1-6 Toss, that beats silvers, but can't break into silver for some reason. I never lose to most of the silvers I face, but whenever I'm about to be promoted a bronze comes along a beats me, hindering my chances of a promotion. I'm just looking for a coach that will teach me how to play mainly Mid and late game, vs Zerg and Terran e.g "Terran does standard 1rax FE, does damage but i defend and no matter what in mid late game my army is always either smaller or not strong enough to even retreat. I know BO's etc. I just want some professional advice. 

Thank you. Sincerely a Struggling Bronze Protoss.