Well the key is to engage your visitors/audience, simple content lockers with human verification are quite the relicts of the past imo, nowadays you have to work harder to get someone's attention and engagement. Start with upgrading the quality of your work (depending what you promote) - better videos, texts, ads, landing page. Gaining trust is hard tho. And I think that there are is not such thing as "countries that their people can complete the content locker offers" - it is not about the nation, everyone can be "bought" or persuaded to complete an offer/buy something/install something.
