Hello Guys,

One of my friend's website domain authority is decreasing since they have moved their domain from HTTP to https. 
There is another problem that his blog is on subfolder with HTTP.
So, can you guys please tell me how to fix this issue and also it's losing some of the rankings like 2-5 positions down.

Here is website URL: myfitfuel.in/
here is the blog URL: myfitfuel.in/mffblog/