How to reach broader audience selling math mock exams and material

Sooo I have 5 official mock exams from OMPT-A (Dutch Math Exams to grant pass to several universities) and a weeks ago I started selling them via Reddit. I also have official study material which is also super essential for most applicants. Until now I have made like 120 euros selling them but I feel like I could be making more. How do I reach a broader audience? I can't post it in the major dutch subreddits as I am prohibited to do so, therefore I have only selled them by contacting people via DM (basically a door to door salesman), helpppp im poor lmao

submitted by /u/mathiasNL0724
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source https://www.reddit.com/r/beermoney/comments/1j6m0kf/how_to_reach_broader_audience_selling_math_mock/