Forums are a good resource for connecting to other authors, but they do not help stories grow in most circumstances, because most authors do not read other authors' work (we're all so busy!). The Wattpad forums were one of the most toxic communities I've ever been on, ever, largely because people didn't understand that simple fact that the forums weren't going to help the stories grow. Honestly, I didn't understand that for a couple years myself, and was constantly frustrated about how my books were getting zero views.
Anyway, in general, Wattpad is not worth posting on. The site and app are poorly designed, and the insights and analytics are locked behind a paywall. There's many millions of stories, and the recommendation algorithms simply don't work, so your stories are no more likely than some Boku no Hero Academia genderswap fan fiction with 3 chapters to get recommended to a reader. If you are looking to write just for fun, and you're writing in the popular genres (hetero romance, MLM romance, erotica, or fan fiction), then Wattpad might be for you. But if it's nearly anything else, it's just not going to work.
I mean, some of my author friends on other sites, ones who genuinely make full-time income off Patreon on their stories, crossposted to Wattpad and got absolutely nothing. The quality of the story does not matter on that site.