Sorry I should not use the wordings "help my channel grow".You have watched many SEO videos... you should know that with the amount of impressions you are getting a 6%-7% CTR is really a good number. Of course CTR isn't based on having custom thumbnails... it's based on getting viewers to click. I like your style honestly (and I am a BIG Spurs fan so your Tim Duncan/Manu Ginobili thumbs win me over immediately). But obviously using more dramatic photos would make a difference. CTR is about standing out from the crowd and creating something that is compelling and clickworthy. A great thumb REALLY grabs a viewers attention and compels them to click.
You should look up your thumbnail with the best CTR and try to reproduce that.
Also I would advise saying things like 'help my channel to grow.' We don't support sub-growth, sub4sub tactics and it's a bit of a bad look for your post.
Thanks bro!As @Stanley Orchard said your CTR is sacrosanct pretty good but to improve you just have to make your content more clickable. Ensure you know who you're audience is and give them exactly what they want. This you can know based on who's watching and what exactly about your content they enjoy the most. I've got can figure this out you can then give them more of that. The same with the thumbnails, as Stanley also said.
Basically, there is no special trick or specific thing to do that can change your CTR higher or lower. It's all about the content and getting your audience to click through now of your content. Make out clickable and watchable.
Number of times someone clicked on your video when presented your video.Can anyone tell ,how to calculate CTR