Any advice to get my mango trees to bear fruits?

https://www.gardeningknowhow.com/edible/fruits/mango/mango-tree-not-producing.htm

I always thought mangoes are like avocados... you need two trees to bear fruit, they say "male" and "female". A friend had one mango tree for at least 8 years and it was big enough to expect fruit but it didn't happen until she planted another mango tree... mangoes aplenty!

Here in sunny australia, my family always prune our trees every 2 years to keep the vigor in fruit production and not leaves.

Mangos are male and female...

first cut back any branches that are dried up then shock the tree with a bat I then dug around the base tore up shredded newspaper and covered up voila fruit good luck

20 years is a long time to wait before addressing this but please call my friends over at Fast Growing Trees the number is 888-545-1978 and they can help you out with whatever you need