Olive tree help

Hi, I've had this olive tree a few years. I was wondering would it be wise to prune it now? I did give it a fairly good prune last year (carefully). It still has a lot of gaps and doesn’t look as full as it did a few years ago. It almost died the year before due to frost so have been carful with it and give it olive tree feed every few weeks in the summer, which did seem to help. Along with not over watering. It sits in a pot on legs in the sunniest spot in my garden. Thank you

 

It's a good looking tree.
Best time to prune is after all risk of frosts have passed, so late Spring just before flowering.
But they don't need much pruning other than keeping it tidy and opening up the centre a bit.

That said, I trim mine any time during spring/summer if there are some long straggly branches and it's been happy with that for over 20 years.