$200 a month? Well, that's a lot.
Why dont you join some ICOs and try getting airdrops?
Dont just focus on the Top10 coin in CMC. Reasearch all coins and go with the most promising coin.
Good idea, before investing into some ICO's you need to research if it's worth to join. There are coins that are very low valued and still not that getting attention. Joining airdrops while you are investing $200 per month is a good way to grow the volume of your coins.