Promotion of a gender fluid dating app and social meeting app to a the public to subscribe

The App is one for dating for gender fluid and gay users. It has been running for some years with about 40k downloads. It has been running as a free service but needs to exploit the paying features. It is a good working app, well maintained, but is not reaching the public to pay for it... (Budget: £10 - £15 GBP, Jobs: Advertising, Brand Management, Content Marketing, Digital Marketing, Marketing, Public Relations, SEO, Social Media Marketing)