I hope you are well. I have shared a link with you which is available in the comment above. A guideline tutorial has been given in this comment. Keep this tutorial in mind and make your gaming content the best. There are some shortcomings that need to be corrected. Due to these shortcomings, you get less voting percentage. We want to provide good authentic content that makes the content look beautiful. There is no need to add extra things. For example, if you have to put something in the thumbnail, put only as much as is needed. For example, if you both have a Ludo team, then only two pictures of you and your opponent are enough. There is no use of the space above and below it, so you can crop the image and make it smaller.
#s34improvement