Some indie manga creators post on social media platforms like Instagram or Tumblr. But keep in mind, the reach might vary. You could also consider creating your own website or blog if you want full control over the presentation and monetization.
You can try posting your manga on popular online platforms like Webtoon or Tapas. They have a large user base and provide a good opportunity for exposure.
Well, social media platforms like Instagram or Twitter can be good options too. Just make sure to use relevant hashtags to reach the right audience. You could also consider creating your own website or blog to showcase your manga and build a dedicated fan following.