Project size increasing

I’m noticing that my project size increases the more I add on to the content, which is normal. But I’m also seeing that it’s still increasing even if I delete some or a lot of the content I added or made. It went from 2.6GB to 3.7GB, all I did was delete some assets and rebuild the light. How could I fix the unnecessary project size?

I saw if I deleted the files in Saved\Autosaves and in Saved\Backup, my project size would go down. here