All your thumbnails have images where you can barely see the build. Make a clearer screenshot of what you've made and clean 'em up. A good, clear, interesting thumbnail is what compels me to look at a creation.

I've tried installing shaders for my screenshots several times but when it's launching, it crashes.
Does anyone know how to fix this?
The game crashed whilst initializing game
Error: java.lang.RuntimeException: Shaders Mod detected. Please remove it, OptiFine has built-in support for shaders.

for example you could try building good stuff? sorry, but maybe nobody likes your builds? (dont wanna insult you)- If you improve your skills and building techniques, the people might likek your stuff!

Ya, what Acier said... If you learn how to do renders, or can find someone who will do renders for you (basically just really nice pictures of your build that they make outside of the game also not just basic screenshots) Usually works for me! I don't really have any examples of ships or submarines, but I do have a lot of renders for reference...

all the posts you gave diamonds too all have very nice renders

a majority of the process of getting clicks is to have a very nice thumbnail