I myself, experienced this, I found it very stressfull because the project that I accidentally removed had days and days of work put into it, and Found it very stressfull to experience.
Step 1: Go to the creator dashboard and find ur starter place where you deleted your place, Right click the game and click “open in new tab”
Step 2: Click on the “Places” option.
Step 3: Click “Add place”
Step 4: This is the important part, Find your game you accidentally removed and click on “Add place”
There you go, the place is back in your asset manager, if its not and you need to restore the place first, then just click the version you wanna restore (i recommend the newest version).
I hope this helped you out and avoided you being stressed out.
This was my first ever tutorial so it might be scuffed.