I drunk so much last time that I will drink moderately next time.
I drunk so much last time that's why I will drink moderately this time.
こんにちは!!
「この前は飲みすぎたので、次は、控えめにします。」というのは「I drunk so much last time that I will drink moderately next time.」と表現になります。または、「I drunk so much last time that's why I will drink moderately this time.」と表現もになります。
「飲み過ぎて二日酔いでひどい状況になったので、次は、控えめにします」を表現すると「I drunk very much so I got a terrible hangover last time, that's why I prefer drink moderately next time.」になります!