It’s ok to take 3 hours to write your introduction, I love it when people have a lot to say! 
Welcome to Rokkenjima, @antimagictoxin! I’m glad to hear you found us through our Twitter! I’m sure the man behind the Twitter, @Aspirety, will love the fact that the Twitter is bringing in fresh faces!
You sound like an awesome veteran for both Higurashi and Umineko! Since you know all the mysteries, I recommend checking out the spoiler threads! That way you can talk about all the fun stuff that happens without worrying about spoiling those who are new to the series. You can also check out our Higurashi 15th Anniversary thread, talk about your favorite characters, the characters you are most similar to, the moments that made you cry, and your favorite scenes for both Higurashi and Umineko. You can also check out the general spoiler topics for both Higurashi and Umineko, how you discovered 07th Expansion, or attempt to explain Umineko in 50 words or less. And if that’s not enough, you can check out other 07th Expansion stuff like Rose Guns Days, When the Game Ends, Iwaihime, TRianThology, and Hotarubi!
You can also check out our tea parties, which it wounds like you already know a little bit about thanks to Twitter! Beginning very very soon is the Higanbana Bookclub! I’m glad you are waiting to read Higanbana with the rest of us! The experience truly is better when you have others to discuss and enjoy the VN along side you! You may win a prize if you contribute to the Higanbana threads, or by contributing fanart! You can also help out by cohosting the Higanbana podcasts!
In the time between now and the Higanbana Bookclub officially stats, I recommend checking out our prior tea parties! So far, we’ve covered arcs 1-5 of Higurashi, episodes 1-4 of Umineko, and the newly translated Higurashi arc, Someutsushi! You can check out our crazy theories by reading the spoiler free topics for all that we’ve covered, or by checking out our lovely podcasts!
And if all of that content still isn’t enough for you, you can check out some of our other stuff! You can show off that manga collection, talk about your favorite movies, talk about video games, talk about music, share your hobbies, share your pets, share your favorite kind of pizza, share your MBTI type, talk about cooking, even talk about your least favorite day of the week!
I’m pleased to meet you. I hope you enjoy your stay here at Rokkenjima~