Just binged through all 6 (really 8-9, considering "half seasons") seasons of Vikings. Seasons 1-4 were the shit, absolutely brilliant TV. Then the show fell down and was pretty bad by the end, oh well.
Vikings: Valhalla is releasing allegedly in 2021, no date yet but they have been filming for 5-6 months now, Netflix paid for 24 episodes probably set over 2 seasons.
Vikings Valhalla takes place around 100 years after Vikings I believe, and covers Leif Eriksson and King William the Conqueror.
What got me into the show was actually Assassins Creed Valhalla, bought that a few weeks ago and been playing every week. Long ass, "its very Ubisoft" kinda game but I've really enjoyed exploring ~890 AD England and you interact with a lot of characters from the show like the Ragnarsonss, King Aelfred, and you start the game in Norway as well. Highly recommend for anyone who loved Vikings, its pedantic and boring enough that its easy to binge the show while playing.
Will jump to The Last Kingdom next, heard its even better so can't wait. Ragnar Lothbrok was such an amazing character and story though.