Try to stay out of render distance until I'm ready to fence/wall it off and light it up for safety. Add a few more farms/composters. Move all beds to a central sleeping barracks...then one night lock them all inside. Gradually move them underground to my autofarms/trading mall/breeder. Then repopulate the village with whatever villagers I no longer care if I keep or lose.
These days I loot any chests but leave the rest undisturbed. I hang a pillager banner renamed "town" on the central well or bell frame, mark it on the map I'm carrying, and continue on with my exploring/mapping trip.