Q.lemon tree isn’t bearing fruit
How to make my lemon tree bear more fruit?

When we lived in Spain, my father had really laden citrus trees
He said that they're greedy hungry plants. If you feed them and water consistently, then they return the favour big time with fruit
A radio station in Sydney Australia called 2GB has a fantastic gardening program called "The Garden Clinic" run by Mr Graham Ross. They often discuss Citrus plants
Hope this helps
Peter in Brussels, Belgium