I wouldn't plant anything else in that pot to compete with your revived tree. You could make the pot look more interesting though with a topping of small washed pebbles or other decorative stones. They will help to retain moisture in your pot and keep weeds at bay. Most garden centres have a range of options to choose from.
Good to see the shrub/tree revived. I would leave the base free of any planting. It may need re-potting next year, so you need to keep an eye on watering more generously. It's not a Bay, it's a Photinia.
I absolutely agree with @Jellyfire Much better grown as a single specimen it has much more impact visually and gives a strong shape. So many plants are already struggling with the dry weather so keep it well watered. I notice you have some other pots nearby. As said a change in leaf shape to the tree would add to the interest.
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
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I notice you have some other pots nearby. As said a change in leaf shape to the tree would add to the interest.