Mongols attack on Europe ended in 1242, Genghis Chan was already dead for years (1162−1227), however death of Ogodei (1229–1241) was one of probably a few reasons, but mainly might be unusually wet weather in that time.

source: https://www.nature.com/articles/srep25606

Also, I love how much people underestimate medieval Europe, Mongols haven't invaded most powerful kingdoms of those times, I don't if they would be able to invade continental Europe, also it would be significantly more difficult when kingdoms would cooperate like in XVI century against Ottomans.

Also please read, how disadvantageous european armies were at the beginning and how they adapted to Mongol tactics: https://en.wikipedia.org/wiki/Mongol_invasion_of_Europe#European_tactics_against_Mongols