After a while, if you are doing what you are doing on a regular basis you won’t be able to notice any changes in the skill that you are learning. So stretching that out and expanding the limits in that particular skill will definitely make you learn new things. Maybe in the long term, there will be significant changes in your skills.
Today if you are learning something new by watching videos on youtube, there is a lot of chances that you won’t be able to continue it for a longer period of time because of the distractions such as ads and other content at the same place. So switching to dedicated websites may be a good idea if you are serious about it.