When I was trying to launch fintech offers in Latam, I encountered a situation where the campaigns seemed to be running, but conversions were almost nonexistent. It turned out the problem was with the settings and creatives, which weren't adapted to the market. Then I came across a case study—
https://roiads.co/blog/push-ads-case-study-finance-offer-pemex-mexico/ — that showed how to properly segment an audience and optimize sources. These tips made it clearer how to approach such campaigns without wasting money.