Get a MicroSD card, and use it.!

Hello, once you delete your pictures/videos from the gallery, you can view them in the recycle bin. You can restore it from there or have it permanently deleted. However they'll auto deleted permanently after 30 days. Hope this helps!! Cheers!! ✌️

if your phone's inbuilt memory is 32GB, and your phone has a memory card slot, just go ahead and use a MicroSD with your desired memory size.!