Hi,
I don’t own MikroTik hardware, yet. And I guess it’s not possible to make
https://github.com/iv-org/invidious
running on such a “slow” hardware, but I just wanted to mention it.
It’s basically a front-end for YouTube and with that you get rid of ads.
https://invidious.tube/feed/popular
https://invidious.xyz/
are public installations, they’re not always up-to-date and it also looks as some content (latest DAZN football videos) isn’t available at all 
But maybe that can be tweaked if you have your own installation.
Greetings,
schotter