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This is a free tool called Online Convert, which you can use to convert a WordPerfect document (and various other types of files) to the Microsoft Word .docx format. There are many different options for file converters online. If you don't want to use this one, you can search for "WPD to DOCX converter." The steps on other converters should be similar. It's in the green box at the center of the screen. This uploads the file to the converter. It's below the green box. The file will now be converted. Once the process is complete, a download button will appear. Depending on your computer, the Save or Save As window may automatically pop up. It's the green button under the "Your converted file" header.  The converted file will now download to your computer.
Go to https://document.online-convert.com/convert-to-docx in a web browser. Click Choose Files. Select the WordPerfect document and click Open. Click Start conversion. Click Download if the Save window didn't appear. Open the folder to which you want to save your file. Click Save.