Which are some of the best places to promote your saas/product/newsletter? (Help me improve my list)

Currently, I promote my newsletter (curatedforfounders.com) in these communities where I have seen conversions: - Twitter (#buildinpublic hashtag seems helpful) - Product Hunt - Beehiiv community (for newsletter) - My existing email list (on mailer lite) - Indiehackers (got very less traction in my experience) I know there are so many communities /platforms, but most are dead or have a very low active user base. Do you know of any other community that founders can use to share their work / promote their products and get new prospects?