get some quality pva youtube acc's, you can find here in elites forum some quality services or create your own accounts
if you have a dynamic IP adress, reset your router before each upload
if ip adress is static you need some proxyes
do not use chrome for upload
use firefox and before each upload clean all (cashe, history, cookies, passwords...) for that you need CCleaner
spin all your videos before upload or shorten them for a few seconds (use some video cutter)
try to avoid direct link in description (instead use watermark in your video clips)