@Barkey is absolutely right. Your text is too small, especially the last two lines. If you don't care about viewers over age 40 who start to have a tougher time reading smaller print or people who have smaller phones, you might be able to get away with it. You shouldn't assume that just because you can read it on your phone, others will too.
Even if people can read it, they are not willing to exert effort to read small text or small images.
Your thumbnail relies entirely on someone's curiosity over a vague question with little imagery. Aside from your channel name, which seems very specific, there is little reference to what your video is about.