I built a public toilet locator app and went viral in Russia

Teary eyed, I got 10K visits just today for my public toilet locator app neartoilets.com . I built and launched this app a couple of months ago and grind for the SEO and organic marketing. Now someone offered me to buy it for $500 . I'm thinking of ways how to monetize it since currently Im relying on donation thru buymeacoffee. Let me know your thoughts on this.