Most YT channels constantly ask you to subscribe. (Including me.) But now I've realized: if someone really likes my content, they'll subscribe on their own.
Begging for subs tends to result in a lot of "empty subscribers" who don't watch most of your videos. I have 150 subscribers on one of my channels, but most videos only get about 20 views.
My point is: you should focus on getting active fans... not increasing your sub count. That way when you do get subscriptions, it means something.