External Funds Used - ie how much you have spent on Steam
https://help.steampowered.com/en/accountdata/AccountSpend

Combined software list - whilst Steam Store version is broken:
https://store.steampowered.com/software

View entire Steam purchase history:
https://help.steampowered.com/en/wizard/HelpWithPurchase

Look up computers used with Steam:
https://help.steampowered.com/en/accountdata/MachineAuthName

Look up Steam log-in history based on location:
https://help.steampowered.com/en/accountdata/SteamLoginHistory

Steam game licences:
https://store.steampowered.com/account/licenses/

Spot any imitations:
https://gtm.steamproxy.vip/search/users/#text=ploppo

A guide on Steam bans:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=961168214

Profiles you have reported:
https://help.steampowered.com/en/accountdata/MyProfileReportsMade