At the present scenario which will be the most profitable coin to mine? I tried a few number of coins but nothing that profitable. Is there any coin that we can make atleast half a dollar per day by mining?
Here is how things are: If you decide to mine a popular currency with a lot of exchanges and value,
it has very high difficulty and very small reward (Monero for example).
If you want to mine something else, you are going to a "speculative mining".
This means you pick a coin or a project in which you believe, start mining
for months or years without clear understanding what is going to happen
and if you are going to earn something.
Then start selling on shady exchanges with high fees and very low volume.
So the only certainty you can have is to join some of the coin teams
and push the project forward yourself to ensure profit at some point.