What happened to Vikings?

 1066

The Viking age ended when the raids stopped. The year 1066 is frequently used as a convenient marker for the end of the Viking age. At the Battle of Stamford Bridge, the Norwegian king Haraldr harðráði was repulsed and killed as he attempted to reclaim a portion of England.

http://www.hurstwic.org/history/articles/society/text/what_happened.htm#:~:text=The%20Viking%20age%20ended%20when,reclaim%20a%20portion%20of%20England.

More and more Norsemen converted telling the Vikings to stop pillaging and all and people started defending their coasts

https://www.quora.com/What-ended-the-Viking-age