Is there a way to allow other workflows before another workflow has completed?

I have a workflow that creates a Thing and adds it to a list. The workflow gets the information needed to create the Thing using a slow API, so the whole process takes around 10 seconds to complete. Because this takes so long, I want to allow the user to still use the app while this process runs in the background. Currently, I can’t trigger any workflows until the workflow using the API completes. How do I get around this?