Our new blog which is only 3 months is getting 50 visitors per day in a very saturated niche. Is it doing ok?
If you ask me I will say that its doing more than ok. 50 visitors in a saturated niche is good for blog which is basically just born.
If its increasing day by day then I will say its doing pretty good.
Since you have already gained exposure its time to take it to the next level.
How can I get to next level?
Now I am publishing about 3 articles per week. Should I increase it?
Publishing more and more articles won't help you much. You have to build a strong backlink profile in order to get ranked better and hence in turn you will get traffic more.