How do I stay disciplined about where I put my money?

You already do the hard thing: you fund what earns its place and cut what does not. That takes a steady hand, because it means telling good things no so the best things can grow. Name that skill in yourself. It is rarer than you think. The danger for someone like you is not chaos. It is drift. Old bets keep their funding out of habit, and comfort quietly replaces judgment. Discipline is not a decision you made once; it is one you renew. Once a quarter, look at where your capital sits and ask of each piece: would I fund this again today, knowing what I know now. If the honest answer is no, move it. That single question keeps your discipline honest.