In your opinion, is it a good decision to migrate on freelancing on blockchain development as a fullstack web developer, by a financial point of view? I guess there is an increasing request and income for blockchain-based projects.

in my opinion, blockchain is a dead horse.

many people have been pointing out legal issues with blockchain technology, so i personally wouldn't want to get involved in that mess, since I don't have the knowledge on economy and law

I have yet to find even one blockchain project that isn't a pyramid scheme, obviously doomed to failure, or a more computationally-expensive way to solve a problem that was already solved without blockchain a decade ago. If I ever do discover one that doesn't fit any of that criteria, maybe then I'll start learning about blockchain development.