Can Goku go ultra instinct again?
The in-story reason for this is provided in the Dragon Ball Super manga series. Speaking with Vegeta, Goku reveals that ever since the Tournament of Power ended,
he's been unable to repeat his Ultra Instinct transformation, implying that the power can only be used in the direst of situations.
Does Goku know hakai?
In the manga, after achieving the Perfected Super Saiyan Blue,
Goku is able to perform Hakai. Goku's Destruction is much slower than Beerus', destroying Fused Zamasu progressively and requiring concentration throughout. Fused Zamasu takes advantage weakness by using Future Mai as a human shield, stopping the technique.
Why did Goku not use ultra instinct?
Originally Answered: Why doesn't Goku use Ultra Instinct in the Broly movie? It's
because Goku couldn't use it at will at the time. Remember Goku just mastered it at the Tournament Of Power not long before the Broly movie so it would make sense that Goku wouldn't be able to use Ultra Instinct when ever he wanted to.