Self discipline techniques

What a crazy game poker is, it tends to draw the crowd who has the least self discipline, yet it is a game where self discipline is one of the most important skills required to succeed in it.

My question is for any experienced players who used to struggle with discipline when they started, have you used any techniques that help you play your best game as much as possible?

Im struggling a lot recently with playing solid poker because of my discipline (im WAY too agressive post flop) and I need to find a way to fix this but am having trouble.