Thanks @v3xx, but I haven't been promoted yet 
- The Regular rank is what Discourse awards for being a regular member, which I gained a few weeks ago, if you're wondering. 
For now, I can only make suggestions. 
Even if I had the ability to remove the 20 characters, I wouldn't want to, and it might not be easily changed either:
https://discourse.soylent.com/t/can-we-remove-the-20-character-minimum-from-posts/4929
I agree with this response:
Is a reply under 20 characters worth it? Just saying "awesome!" or "good job!" doesn't contribute to the dialogue. There's the "like this post" function for things like that. I'd rather read thoughtfully composed responses that take more than 10 seconds out of someone's stream of consciousness than have to skim through impulsive fluff.
No offense intended. It's just my take on why the limit is there in the first place.