I wanted to share my recipe for compost tea, which I credit with eliminating transplant shock. I use it whenever I transplant and my plants hit the ground running.

Barrel of rainwater
Armload of stinging nettles
Armload of comfrey leaves
Shovel- full of very fresh manure

Age two days, strain, add to water about 2:1 (more water). When I transplant seedlings or perennials, I dig the hole and fill it with the tea half-strength, then place the seedling directly in the water, then pack the soil around. They love it! I have absolutely no transplant shock with this method. I go a little easier on the amount when transplanting dry-loving plants. But everybody seems to love it.

That's a good recipe Hilde, the components that actually prevent the transplant shock are the Nettles and comfrey, the manure adds more microbiome and nutrients for root growth which is what establishes the plant faster.
You could make it more microbiome active with an addition of air and a little molasses for bacteria food, should you want to do that.