youtube tags hits list

So my Youtube Channel is super weird. I started my channel about 5 Years ago and had some small videos on it and all of them got tons of views. Since 1 year ago I started to do some Vlogging and other small videos and all of them never went up over 100-500 views. I just don't get it. Something...

Hey guys, can anyone provide me with a source explaining youtube tags, in terms of what is unnecessary and what isnt. For example, if i have the tag "win free iphone 5 now", is it necessary to put the tags "win free iphone 5" or "free iphone 5 now"? Or does the single tag "win free iphone 5...

Could anyone possibly tell me whether there are lists of tags which will provide you with many hits on Youtube? Thanks in advance!