I have a lot of spam users signup on my wordpress website.

I have a lot of spam users signup on my wordpress website. I end up manually deleting them but notice that the User IDs dont get reused. I have around 39 legitimate users on my website right now but as you can see in the attached screenshot, the user ID count is closing 2000! How can I force WP to reuse IDs for deleted users?

Thanks
Shireen