Free Ways to Enrich Companies from Sales Navigator CSV Data

I've manually selected companies from Sales Navigator, exported them into a CSV, and uploaded the file into a table. Is there a way to enrich these companies for free, similar to the 'Find Company' function in Clay, instead of paying 1 credit because of the CSV upload? I already have the company name, LinkedIn URL, and domain in the table, but want the fully enriched company. I’m looking to handpick companies, as opposed to exporting large lists where most aren't my ICP. Any advice?