This question has been raised several times, and I have noticed that some people conclude that the lack of adoption is due to people not understanding Bitcoin or seeing it as a scam.
But I don't think the world still views Bitcoin as a bad thing today, though I know a lot of you thought that, but it is not the case.
In my country during the reign of the popular moribund Ponzi scheme MMM the scheme initially adopted Bitcoin as a means of payment, however when they scheme went bankrupt some people then became skeptical about authenticity and credibility of Bitcoin with a perfection of being a scam it's takes a lot of orientation and enlightenment to those people so as to disassociate Bitcoin from the fraudulent scheme, however with time a lot of people began to adopt Bitcoin by investing, trading and staking as well as utilizing all sorts of opportunities associated with Bitcoin like P2P merchanting with Binance etc, while some set of freelancers in my country also adopted Bitcoin as their payment gateway.