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You need to use UniConverter free YouTube thumbnail maker, with which you text into prompts, choose desired styles and aspect ratio, and hit on "generate", you will get a professional and eye-catching thumbnail within no time.

Here is a link to the tutorial:

https://support.wondershare.com/how-tos/uniconverter/how-to-make-a-thumbnail-with-ai-in-uniconverter.html