How to start? Before & after pictures network


I have been building this website in my free time for several years. During this time, internet marketing has changed a lot, and I don’t know how to start to attract users.
The idea of my project – publishing before-and-after pictures. This can be useful to a wide range of people and businesses. Designers, builders, plastic surgeons, everyone who changes the visualization. Weight loss, bodybuilding, makeup, as we looked in childhood and now.
Hope to get some valuable tips here.
My project

Thank you in advance for your tips.
Alexander