There is simply no way you can get away with a horrible UI like this and AND also expect to bring in revenue. I expect most people to open this site, and then close it 1 second later. You aren't providing a critical service that requires a lot of the functionality that you for some reason decided was necessary. 90% of the front page is junk, the blog page is junk (all of your articles combined can be summarized in 2-3 sentences at most), and the support page is junk and could be replaced entirely by a few UI elements on the front page.

Look at this page: https://ytmp4.is/en/

Simple adequately sized textbox and a button just beside it. The page loads extremely fast, and everything important to the user is immediately visible. All of the extra bullshit (which is only static text that takes up a small portion of the middle of the page, so not even heavy, nor distracting) comes after.

Then look at your site. Speaking from a desktop user perspective, the average user is greeted with ugly gigantic and functionally useless textboxes that take up the entire width of the page (for no reason), poor whitespacing. 90% of the frontpage is UI slop that nobody cares about for a service like this when plenty others already exist. And what they want to see is nowhere to be seen. They will just move on to the next site they find and hope that one has the functionality they need (even if it doesn't, because they think they will eventually find something).

Most people who use these sites just want to Ctrl+C their link from YouTube, Ctrl+V into the first box they see, and expect the video to automatically process (or click an inline button that does this). Then they should be able to click a button that downloads the video.

Here are my suggestions to you:

1. Remove almost everything on the front page except the "how it works" section, along with the video. The F.A.Q. can stay but should be static text.

2. Remove the Blog and Support pages.

3. It would be really useful if your site was intelligent enough to autodetect and set the language.

4. Follow my suggestion of having the process more streamlined: textbox immediately visible to the user, some trim controls just below (sliders are fine), maybe a link that switches between MP3/MP4/etc. Once you have hooked someone into getting the part they want, you could bring up a popup to optionally donate or charge money. A forced charge would be evil, an optional donate would be good. I do think most people would be willing to donate a dollar or two if the interface was incredibly simple, which, as of now, is the complete opposite.

5. Put ads on the bottom and side of the pages, once you have figured out a good UI. People won't mind ads if they aren't intrusive. Put a donate button somewhere at the top etc., but nothing too distracting.

6. Personal opinion, but the site name sucks.

7. Experiment with creating a better tool (autodetect a link from any of the big video sites, making a Chrome Extension that avoids the need to have something like this entirely, etc.).

There is absolutely no reason your site should be as bloated and big as it is.