One thing you can try is while you are visualizing, narrate what you are trying to visualize in your mind. So instead of just trying to imagine it, imagine the scene, but talk to yourself as though you are narrating the scene as well.
Hello Sir, I'm a professional graphic designer, and I really want to work with you as a thumbnail designer. I reviewed your UA-cam channel and found that your current thumbnails good but look very simple and not that clicky, eye-catching, or attractive, which is really not suitable for your channel. If I work with you, it will save your time, and your videos will perform much better. I will make very attractive, eye-catching, and high-quality professional thumbnails for you that will grab the viewers' attention and increase the CTR of your videos for sure. I re-designed one of your video thumbnail, would you like to see?
I can't visualize properly i am distracted all the time
One thing you can try is while you are visualizing, narrate what you are trying to visualize in your mind. So instead of just trying to imagine it, imagine the scene, but talk to yourself as though you are narrating the scene as well.
Hello Sir, I'm a professional graphic designer, and I really want to work with you as a thumbnail designer. I reviewed your UA-cam channel and found that your current thumbnails good but look very simple and not that clicky, eye-catching, or attractive, which is really not suitable for your channel. If I work with you, it will save your time, and your videos will perform much better. I will make very attractive, eye-catching, and high-quality professional thumbnails for you that will grab the viewers' attention and increase the CTR of your videos for sure. I re-designed one of your video thumbnail, would you like to see?