Mathematics is a practice that anyone anywhere can participate in, regardless of ability. This may be difficult to realize when you see no one like yourself in positions of mathematical authority. Meet a Mathematician is a website with the stated mission to share stories of mathematicians from different backgrounds, especially from historically excluded groups, with the aim of introducing students to role models and fostering a sense of community.
A nonprofit started by my Ph.D. advisor, Dr. Pamela E. Harris, and others, with the mission of showcasing the contributions of Latinx and Hispanic mathematicians. Beginning in 2016, Lathisms has provided lists of notable Hispanic mathematicians and extensive biographies. They also provide scholarships to Hispanic and Latinx students mainly studying in the fields of scientific research, mathematics education, engineering, and finance.
AMS Recognizing Diverse Mathematicians
The American Mathematical Society (AMS) page listing numerous websites and resources for mathematicians in underrepresented communities. This page helps you to become an advocate for those in your community, to advance yourself professionally, and get help for issues your community is facing.
A well-regarded YouTube channel among mathematicians, known for its quality and approachable interviews of (mostly British) mathematicians and diverse topics. I have gained a lot of inspiration from these videos.
I do not know Matthew Scroggs, but I have enjoyed the puzzles he posted on his blog regularly since 2014. I even did a high school project inspired by one of the puzzles on this page. The difficulty of these puzzles can range, but they rarely require the skills beyond a usual high school education, though they may require considerable creativity!