Attract big youtubers to the site People like Markiplier, PewDiePie, MrBeast, etc. Get a time exclusivity deal with them if possible, but at least get them to upload to both YouTube and Vidlii. Make them announce it on their channels so people know they can watch them on Vidlii. This would all but ensure Vidlii blowing up in popularity and YouTube withering and dying. Once Markiplier, Pewds, etc. switch sites (pun intended), their audiences will follow. It's a guarantee.

let us search for channels, add a playlist main tab, nico nico scrolling comments add a playlist tab between videos and channels on the main tab, and make us able to search for channels on the bar. Also add a counter for new users and nico nico video scrolling comments

porn filter we do not want idiots jerking off to vidlii

Bring back annotations? The old Youtube Annotations would be very fun to have.

App and quality You should definitely make an app.

Also so far apparently everyone can upload in 360p and partners in 480p. In VidLii 2.0 partners will able to upload 720p videos. What about normal users? They should have 480p instead.