What you're writing makes sense but the way to get crypto work will be by coming up with cool stuff from the things you've learnt along the way. It's free and accessible to all.

The type of people who know enough to employ you will be just as sceptical and mystified as us lot if you showed them your wee certificate.

If that $150-200 or whatever isn't a lot of money to you then go for it and do it for yourself. If the cost is going to make your life harder than it needs to be then I'd think again. Other than your own satisfaction and pleasure I don't think it'll make any difference for your actual prospects.

There will be free courses from more reputable places. There's one put together by the University of California, Berkeley - https://www.edx.org/course/bitcoin-and-cryptocurrencies  that's free but charges if you want some form of certification.

Several top places offer courses here - https://www.coursera.org/courses?query=bitcoin

If I were you I'd give it a few days or weeks of sucking up quality resources that are free and then have a think. This is one of many good places to kick off with - https://lopp.net/bitcoin.html