Your old self isn’t your enemy. It got you here. You can just stop letting it drive.

The person you used to be was solving real problems with the tools available at the time. The guardedness, the joking, the overworking, the habit of agreeing: all of it did something useful once, which is why it is still installed. Treating it as an enemy turns this into a fight with yourself, and nobody wins those. It needs retiring from a job it has outgrown.

Name one old rule you still run on, then decide where it still earns its place and where it does not. Keep it for the situations it was built for, and take the keys back everywhere else.