I bought a game and I can't remember the account email/username

[76561198817997259]

A year or two ago I bought Papers, Please, and I've been trying to play it again recently but I can't play the game because it sends me to the store. It's been on my computer since I bought it and I've tried every email I can think of to get it back. If anyone can help, thank you.

[Dr.Shadowds 🐉]

Login to the account that you bought the game on, if you do not know what account you used that bought the game on, then search for the game by email, or phone number if you used it on the account that has the game.
https://support.steampowered.com/kb_article.php?ref=5421-QTFB-3090

If you can not find your account by name, email, or phone number, then support can not help you at all, until you're able to remember the account name, email on the account, or phone number you link on the account.

If you did family share with someone, then that would be why you were able to play the game, because you did family share with someone that has the game.