i deleted my google history and i cant find a cool project i played

This may not be a Question about Scratch
However, I’d suggest checking your favorites.
If you remember the creator, look for their account.
You can also check your Hardrive(IF you know how to.)

how do i look at harddrive on chromebook

I’m not really used to Chromebook. It could also be quite dangerous, as getting caught doing it may invalidate the EULA. I’d suggest checking your favorites first, and than looking for a trusted Chromebook expert, if you’re 100% sure you’re ok with checking the Hardrive.
Please note checking it in certain ways could cause some data corruption from my knowledge, and you shouldnt change anything. Also only do it if its with your computer. I believe it may take 2 to check a hard drive as well
Edit: There may be an easier way, https://support.google.com/chrome/thread/135917744/recovering-browser-history?hl=en

If the project you are looking for was viewed very recently, you might be able to find it again by going to any studio that you can add projects to, pressing “Browse Projects”, switching to “Recent” tab and looking there.

You can look in your Google account's activity: Or you can go to your browsing history stored on the device: