Lemon & Lime tree dropped flowers

New to citrus. Pruned back my lemon and lime tree in the winter, had hundreds of flowers on both trees and even little fruits.

The trees have since dropped all of the fruit (they were tiny) and has exploded in growth.

Advice would be appreciated as we go into summer! The lemon tree (larger) has some fruit but the lime (behind it) has none.

Sunshine Coast, QLD