Perhaps you already know who or what you would like to write about, however, if you would like some ideas, check out an extensive list here: IGB Edit-a-thon 2023 Spreadsheet (information will continue to be added up to the edit-a-thon dates).
This list contains diverse individuals from across the sciences, there are even some folks with history at the University of Illinois on this list.
From Wikipedia's "What to Include" page
General scope of facts and information to include
Things to Consider When Editing
As you look through the list provided of possible people to highlight in Wikipedia, consider the following about what might be missing from certain pages: