Where should I promote my design-related side-project?

I am running a weekly newsletter which is called Creativerly. Creativerly is a weekly digest about tools and resources which boost your creativity and productivity. Combined with useful insights, articles, and learnings from the fields of design and tech, this newsletter was built for the creative community.

Currently I am promoting the newsletter on Twitter, Reddit, and also LinkedIn. I shared it to a couple of Facebook groups which brought in some early subscribers. On Reddit, Twitter and LinkedIn I try to engage with design-related groups and people by leaving useful comments on different topics, and also using those comments as a plug to my newsletter.

Nevertheless I am searching for some more sites where I am able to promote my newsletter. Since I do not want to just cold message people on Twitter/LinkedIn, but I want to take my time to really engage with a post where I can leave useful insights on a topic and after that leaving a plug for my newsletter. This is working out well right now, but I also have to look for specific postings where I can give some inputs. Since I started to write a personal blog I also try to promote my newsletter through different blog posts I write.

Does anybody have some suggestions? I know about Designernews but still have to try it. Anything which would be a good fit?

Thank you in advance!