Which platform you advertising your app?

It depends on your target;)

Indie Hackers! Not paid advertising though :)

if it's a mobile app, Search Ads Apple & Instagram

Hello, in general, I use outdoor advertising for my business, It's very popular now, so I advise you to try it. I can recommend you an article where more is written about this: https://timebusinessnews.com/wha...

Instagram is such a great platform for promoting apps! It’s super visual and lets you connect with a huge audience. Plus, the ad tools are pretty solid for targeting the right users. Definitely worth trying out!" This is my current product Soapoperadaily