Could someone provide insight and explain why I received a warning and was suspended for...

Because it's considered spam/advertising.

LFG posts are only for looking for others to play a game with. They should essentially be "I'm looking for x amount of people to play this game with". Anything other than that will usually result in a suspension.

Again, it's just because that post happened to get reported. Your other ones just hadn't been reported yet.

Just because other people do it, it doesn't mean it's allowed. Someone just happened to report your post so you got suspended. If the other posts get reported, they will too.

I mean, kind of, yes, but most of the posts I see are similar to this. I know some people who post similar content, and they have never been suspended before. That's what is most confusing for me. Sure, Most people don't use emojis in their posts, and if they do, it's not as many as I do.

Can you please show me where the rules for group posts are? I searched through the community standards and found nothing related to my situation. I also looked at some Reddit posts about it but found no relevant information. Could you direct me to the appropriate resources for my circumstances? When I say it does not fit my circumstances, I mean that it is not something my post violated.