What will you do when someone imitates your account?

Have you ever imagined?
if someone uses your name and doing scam?
maybe some have experienced and even become victims
but some also never imagined
and maybe some of you can imitate someone

This post is only for knowing
what would you do if someone used your data in steam to do scam?
don't expect those who imitate only 1 ~ 10
but it can also be up to hundreds
or maybe more

Here are some pictures that I experienced :
https://i.postimg.cc/D099NvFF/Screenshot-194.png
https://i.postimg.cc/mDv4vNN0/Screenshot-195.png
https://i.postimg.cc/dQZt5Dmb/Screenshot-196.png
https://i.postimg.cc/J4WmKxhX/Screenshot-197.png

I hope I get advice that fits my situation

they are not just using my name
they even using my real name Min Hsuan Tsai
and they using my old profile picture
that is why i change everything at my steam profile
Profile Pic, Nickname, and even Name i using at steam

doesnt their profile design just copying me ?
i even have psd file for that profile (since its my old profile)
and all of them using bio for visit link and trade dota2 item

and this i though this is older pic i've for proof if that was my profile and nick
https://i.postimg.cc/Y9kndnWj/image-1.png
it was 1 september 2018

and even maybe could be older than it