This is great advice! you are like a wise sage! Research Topic...is it trending.Don't underestimate the power of researching your topics BEFORE you make your videos to see if there's even any demand for them. If no one is interested in the topic before you make the video, it might be better looking for differant topics that ARE searched for in your niche. Case in point, people aren't that interested in watching hybrid dinosaur drawing timelapses, I found this out AFTER publishing and getting very low views. There wasn't many videos out there for me to research so I wasn't sure if there was a demand or not, and evidently there really wasn't.
Topic is important.
The best thumbnails and titles in the world won't save you if the topic isn't interesting enough for people to click in the first place. I'm one of those people who vouch for the importance of a good thumbnail. but a "good" thumbnail is highly subjective. Topics are pretty cut and clear as to if they are interesting to people or not.