Separate the castings from the soil? The castings enrich the soil. You can just use it.
To get the worms out safely punch about 1/2 inch or less holes in the bottom of another container, put raw compost in it, and put the 2nd container on the first. The worms will migrate into it in a few days.
You can also make a casting tea by soaking it and collecting the effluent. Use immediatly as fertilizer so it will have the highest number of beneficial bacteria and fungi. Alternatively put the soil in cheese cloth or burlap and immerse it to collect the tea.
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