Second google link for "how to replenish a magnet"
"Take the magnet which has lost its power and stroke it with the stronger magnet. Linear strokes in a single direction will realign the electrons within the magnet, which will help its strength to increase. Stroke the magnet for around 15 minutes, and check to see if the strength has returned."
…. that skillset ought to be pretty well established for some folks here:)) (edited)