Treat your plans like a GPS route, not a tattoo. Recalculating is built into the design.

Plans are useful as directions and harmful as commitments. When you treat one as permanent, every piece of new information becomes a threat rather than something to use, and you end up defending a route you chose while knowing less than you know now. Recalculating was always part of how it works.

Write your current plan in a form you can edit. Once a month, ask what you have learned that the earlier version did not have. Change the route freely and keep the destination under review too.