It is relatively easy to learn a new programming tool after your first dozen . . .

“Skills,” in any programming tool, do not merely consist of understanding the vagaries of the syntax.   Nor can they, realistically, merely consist of knowing how to configure a tool (e.g. Drupal) that some other programmer has designed.   You might find work doing that, but it will be a race to the bottom because there is really no barrier to entry ... and the workplace is stuffed with an over-supply of qualified (sic) people.   There is no “room for one more.”

I would suggest to you that the entire market for “custom-built web sites” is rapidly disappearing and that it will never return.   PHP is a tool that is adequate for doing that but not good for much more.   You would do well to turn your attention away from the notion of being a “web” developer.   In my opinion, those days are done.

Languages such as Perl are general-purpose systems that, as such, have considerably more applicability and utility.   Many people who flooded into the programming world in response to “the web” are flooding out of it again, leaving the field somewhat more open to people who can imagine doing things with computers beyond sending database outputs in HTML form to distant web-browsers run by grandmothers.