Help me Please!

My guess is it's like that because other members of the Steam Community have reported you for attempting trade scams. (But I can't speak for Valve)

If you see this and have second thoughts then don't trade with that user.

Edit: I read that backwards - YOU were being reported by others to Valve.
Either way your issue is with Valve and Steam Support - you can contact them by going here.
https://support.steampowered.com/

Hello @reacioNy ★ ,

Users can report your Steam Profile for "attempting trade scams" and if your profile is reported multiple times by multiple users you can get "flagged" for "attempting trade scams" when someone tries to trade with you, this is a little notification window that shows this. You can test this with your friend or with an alt by opening a trade offer url with your "main" account or your friend can just invite you to trade and you can respond to it. That warning for "attempting trade scams" will go away in the close future if nobody else reports you, it works like a cooldown system, now before you panic or wonder what you did wrong, well you maybe didn't do anything wrong. Users can randomly spam report your Steam profile and it can trigger this "warning" when someone tries to trade with you, I noticed that a lot of users do this just to troll others, fake report other users out of some kind of revenge or similar or they're just mad about your offer, maybe you declined a trade offer or counter offered something which the other user didn't like and got mad over it so he decided to spam report your Profile. There are multiple reasons for this "flag warning", but don't worry if you didn't do anything wrong then you are good.

Regards

That would make sense on fake bots, of which there are a lot. Make sure you trust the website, and follow the website's instructions to verify the bot to the letter.