Advertising where and how

Hello,

has any of you already successfully advertised your app (and increased downloads) and can share your experience? For example which types are the most successful (banners, pictures or videos), through which channels (Appstore, Facebook, Instagram...)

And does anyone know how to create these interactive ads, where you do "tasks" or something like that and then at the end you are forwarded or you can close the ad?

All I've tried so far are small ads with Google Ads, but they haven't been successful yet :/