Pat is dead on with the keywords.Also in the titles, not too much but includes genre-instruments-etc.
Also in your "public" email's include your channel link in the signature.
Also in pertinent forum signature.
I do not place the link in the Yamaha keyboard site belong too, not pertinent.
Not like the big guys, but very happy with the views on my channel.
Also if you watch the channel analytics, you can pick up on where the views
are originating.
About 75 % are YT internal for me.
Again as Pat mentioned Keywords, instruments, genre, any words that may pertain
to or someone can think of. Optimization is an artform.
Also if your playing a Gibson Guitar, big keyword, or whatever brand.
Give credits to PG Music, Sonar folks, or any key software titles you may be using.
These are "hit" search works.
I use XLN Addictive keys, not biggie, but just for "halibut" I did YT search for
"
Addictive keys blues". 2 of my creations using Jon Jarvis 12-8 super midi are listed in this link. Surprised me... Our Babe Blues....Lazy River Blues.
https://www.youtube.com/results?search_query=addictive+keys+blues&page=4FWIW, we cannot use the PG Realtrack, or super miditrack performer names, and I don't.Also some number of YT folks do add a paragraph of keywords or near subject keywords
in the Description area.
Also after bit of time goes by you do find out what folks are looking for.
After the fact thoughts. QR codes are extremely common. iphones and many other smart
phones have abilities to read these codes. Take note of most magazines.
Some number of free sites where you can print up you own QR code and download as a
.jpg Creating one with your YT channel link would open up whole new area for you. Put in business cards, email, flyers, whatever.