Congrats on the pattern release - it looks very cute!
Your pattern will be automatically promoted to people who will love it on the platform although we’re sure some designers here will have some great marketing tips!
I use Instagram - there I have found alot of crafty friends who share the same passion as me. I have found process pics is very good “teasers” for a pattern. I think it is because my followers is more familiar, and will be remined of the pattern more than once. -I post maybe 2-3 process pictures and then a final “The pattern is out” post. Sometimes the pattern does kinda well, sometimes the pattern is not a succes. Just keep trying and keep finding something YOU want to do