The plot is this guy is transmigrated from earth,and he lives until his old age tring enter in a sect, in the mean time he adopts many children and tries to put them in a sect for the hope that when one of them enters, they shoud help him with his cultivation. but when two of them manges to enter in big sects they abandon his father and left him to die and be berated
It's either Immortal, or Everlasting Immortal Firmament. Both came from the same author. If you do read Everlasting Immortal Firmament, do read Chronicles of Gu Hai; it's the prequel, and it's already completed.
It's bothering me, so I have to say it: can we please not call something not that's not wuxia, wuxia?
And even when they read it, they still get it wrong. It's pretty easy to misunderstand because going by the description it sounds just like toned down xianxia. If you actually read it though it's easy to figure out how wrong that impression is.