By the way, I support the idea of online photo editors. They are easy to use and simple, so you should not have any problems creating a sticker. I usually use
https://create .vista.com/features/background-remover/ because they have a simple interface and a lot of templates. Therefore, creating simple stickers or Instagram posts using this site is quite convenient. Try it, and you and I am sure you will be able to do what you need easily and quickly. Good luck to you!