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There may exist forums that talk about your chosen topic; I share my writing on a heavy metal forum therefore, searching for media that directly relate to your topics is beneficial. However, wordpress, social media platforms of any kind as well as Wattpad are some good ones I have used before.
I haven't tried this yet but according to online course I have watched it is motivation and encourage through presents or simple try to talk to them and connect to them in their online community Like right now by answering this question I might connect to other bloggers on this site to help me with my blog posts at managtonpost at my WordPress blog :D
That, I really don't know. Do share such forums if you find.