On the Category:Unsourced Profiles page, select the letter 'M' from the Jump to a letter: option in the infobox. This will take you to all 'M' profiles: https://www.wikitree.com/index.php?title=Category:Unsourced_Profiles&from=M and then you navigate pages forward as needed.
You can also tweak the URL to jump to a specific name, such as: https://www.wikitree.com/index.php?title=Category:Unsourced_Profiles&from=Metz.