Because it was marked as AI content does not necessarily mean it is AI content, AI tools can be wrong.
AI detective tools can be wrong but if many tools say your post is AI-generated with high percent, it's red flag. It can be plagiarism if you actually use AI and don't say about it publicly in your post.
The point is your content possibly not good in quality too and if you have many "possible" AI-generated, low quality posts, you are not a good poster. You can improve and become a better member, but you can choose to be what you are now. The advice is if you won't improve, you won't go to higher ranks because merit system is to prevent spammers ranking up.
When your appearance is like a consistent spammer, you will have risk that merit sources add you to ignore list, and you will have less chance to receive merit.
All you need to do is read and understand.
Read and understand it is more important than post and teach other members when they are newbies. Their main concern is knowledge and their focus should be read to learn and to understand what they read.