If you absolutely need FR24 Premium specifically and cannot pay or host a feeder, your only option is to wait for a rare promo or split a family plan with friends (though FR24’s terms limit sharing).
Believe it or not, the best answer to is the official 7-day free trial . flightradar24 premium account free better
If you are looking for a free upgrade, there are two legitimate ways to do it: Become a Data Feeder (Best Long-Term Value): If you absolutely need FR24 Premium specifically and