Build evidence for hope.

Hope built on nothing is fragile, and hope built on a record is not. Every small thing that works, every problem you solved, every time it turned out better than expected is material you can point to when doubt arrives. Collecting it deliberately makes a real difference.

Start keeping a simple record of things that went better than you feared. Read it when you are low. Belief supported by your own history is much harder to argue with than belief supported by encouragement.