ok so here is my question none of my video's are fast growers but my most popular video was uploaded quite a while ago but it consitantly brings in 150+ views every single day day in and day out and has for a very long time. constantly bringing new people into the channel. it ranks well in google search as well as youtube search and also brings in lots of views from suggested video's. it has a pretty poor thumbnail. some of my more recent thumbnails trying to create some branding and a consistency between my thumbnails so people recognize it as a video from my channel. here are some of my recent thumbnails. btw I don't know why the black bars top and bottom appeared when I downloaded the thumbnails they are not present on YouTube. I am scared to change anything about what I would consider a very successful video. however at the same time I feel people are clicking it despite the thumbnail rather than because of it. and if I were to re work my thumbnail a bit in a more current style the new people coming into my channel would more easily recognize my other video's I think it would be beneficial to update the thumbnail however I am afraid to hurt a good preforming video. what would you do?