Saying sorry opens the door. Changing is walking through it.

An apology is a start, not a settlement. It tells the other person you understand what happened, which matters, and then it leaves the actual question open: will the same thing happen again. Words cost very little, so people read them against what follows. The repair happens over the next few weeks, not in the sentence.

After the next apology you give, name one specific thing you will do differently and then do it where they can see. Not a promise, a change. If you cannot think of one, the apology probably needs more thought before it needs sending.