Before joining Fiverr you should have improved your English. Fiverr is an international marketplace. If you send a message to your buyer with this English it will make a terrible impression.
There are already many articles written by the experts. You should research a bit and find those topics raised by the top-rated freelancer for more valuable information. You can follow this topic. This should help you. Good luck.
In my opinion, Fiverr forum badges have nothing to do with your gig performance. The Fiverr forum is for gaining more knowledge about Fiverr, getting suggestions from experienced freelancers, staying updated about the latest Fiverr updates, etc.
From my point of view, you should focus on improving your English. As Fiverr is an international marketplace with sellers and buyers from all over the world, it's very important to have good English skills to achieve success. I hope you won't take this negatively.