Pass the torch while your arm is still strong enough to hand it over properly.

Handing something over while you are still good at it feels early, which is exactly why it works. Waiting until you are forced out means the next person inherits it at its weakest, with no time to learn from you and nobody to ask. A handover done from strength is a gift. One done from exhaustion is a problem passed along with your name on it.

Pick who comes next before you need to, and start letting them run things while you are still around to catch mistakes. Leave notes. Then genuinely stop steering.