Now that your brush is clean, wet, and fully shaped back to the way it arrived, leave it lying flat on a paper towel or hang it upside down. Leaving it with the bristles up can ruin the brush and get moisture into the wooden handle.
Let it dry for 8 hours and it’s ready to use again! Store it in a bag or brush organizer when it’s dry and not being used. This should help preserve your brush for the long haul and make your investment, whether big or small, completely worth it.