There are a few ways, pick one, or mix and match!
1: Have a girly name, girly profile picture, or post a selfie showing that you are female. This will ensure thousands of thirst posts. The more innocent the better.
2: Do something everywhere. Doesn't matter what it is. Post a picture of something everywhere, or sign every post you make! Best paired with #1. Prime examples are: Cattie, TheGreatNike, and Drakus.
3: RP like it's no tomorrow. This is best paired with #2, and can be used anywhere! Go [i]way too far.[/i] Further the better, to the point where no one can take you seriously. *cough Drakus*
4: Porn. Post it in a thread. Or if you're too lazy, post it in [u]all the threads.[/u] If you want this to last, make tons of alts to do it too.
5: If you have #1, you can make a thread! Make sure it's a poll, and put something [i]really[/i] easy to remember. This pulls in the thirsty ones who can now spread your legacy!
6: Be a dick to everyone you meet. This one is for the long run. Make sure you have very strong feeling about your opinions, call everyone vulgar names, and don't forget to be homophobic! Prime example: Noiselesspurse.
7: Comment to everyone in your threads. Make sure you're friendly and treat people the way you'd want to be treated. Be creative! This is the best way to ensure you become well known, and well liked. Prime example: Griizly.
8: Make a controversial post. Any will do! The best ones are feminist posts, and religious posts. But saying "Donald trump 2016" will do.
I may update with more guides later.
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You forgot to add that one also needs to copy as much stuff from 4chan as possible to reach anykind of forum fame.