If one does not receive corresponding cultivation methods for cultivation, after entering the True God Realm, they would be stuck and unable to advance any further.
This is also why the gap between the early and mid-stage of the True God Realm is so huge.
The various sects have strict monopolies on their cultivation methods, even towards their own people. This is to prevent the theft by those with ulterior motives. This has led to a phenomenon where, to obtain top-tier cultivation methods, one can either exchange them with Contribution Points within their own sect, or exchange them with Merit Points from battles.
This reminded Yang Chen of when he first joined the sect and how the old fellows like Dream Trace Daoist didn't want him to learn those top-tier cultivation methods.