I have no mangos ever
I never have mangos. What is the best fertilizer just for mangos only?
Certified GKH Gardening Expert
It is important to keep in mind that if this is a mango from seed, then it can be up to six years before it bears its first fruit. If this is not the case, then there could be other issues, including fertilization. It isn't necessary to find a fertilizer made just for mangoes, but I'm sure they exist.
These two articles will help you to find out why this is happening: