theres 2 stages to youtube.
1 - all the stuff you can do to make your video the best up to uploading. (none of this is luck based)
2 - everything that happens AFTER you upload. (some luck involved)
It's up to me to make a video the best of my ability, and if it does poorly, ive probably missed some things, there's always room for improvement. however, if someone watching shares my video to reddit and it ends up on the front page for a ton of views, thats what I would call 'luck' and it can have a good impact.
All we can do is focus on step 1, and hope youtube and viewers boost the video in step 2