A lot of fans were complaining that the sequel plot is weak compared to the first, since the son is getting pretty much a lot of his power handed to him. Guess the author decided to up the ante.
well ppl liked the first series mainly cuz dude when through hell to become decently strong and still get beaten up + he also have to overcome a shit tons of trials, dude also couldnt beat the dragon monarch and also set up a trap to kill him but in this sequel the MC have a system purely to help him get stronger without any bad intents and he also get extremely op abilities and also "companion" and beru to help him early on
well in my opinion ppl just expected to have the same typa progession as the original but they also gotta remember that they even mind dropping a sequel considering that they made over 15m USD(information from googles and some articles) the original made
(author can just end a story after the last chapter and move on but sometimes they drop a sequel, which can either be more popular than the original or not as popular and also could just get fucking axe if not generate enough revenue)
tbh i think ppl just thinks of this as a continution of solo leveling and not a sequel