There's no secret because your rate of development is whatever you put into it.
Even in this age of instant gratification you can only assimilate what you learn at your own pace. Whether it's self-discovery, book learning or watching Youtube videos or trying to sort through dross on the web, to take it in, consider how it relates to your experiences/knowledge so far, and to develop... just has to be done.
There's a lot more material about now than say 20 years ago but that doesn't reduce the search time unless you're lucky because there's a lot more dross about too.
If I knew of a magic wand to speed it all up I'd buy one.

The easiest ways to alter your state of consciousness can't be discussed here and anyway need some preparation if they're to be useful...