This is my first month I decided to buy 70% BTC and 30% other crypto. Right now Monetha (MTH) price is falling and if my predictions are truth it will hit $0.02 - $0.03. I will wait for that price point with MTH and in meantime buy on dips other crypto I follow: VIB, SNM, COB, KNC, COSS, SUB, SNC, DMT and CTR.
Keep in mind when Bitcoin is on rise, other crypto price is going down at best stay neutral: VIB, KNC, SNC didn't bleed like Monetha.
I use EtherDelta exchange for buying MTH, low few but a little time to learn is required (how to use it). There is a YouTube videos about it, make sure you bookmark this link: http://etherdelta.com there is fake links all over internet, one letter missing or added and you can get scammed.
List of all exchanges related with Monetha can be found here: https://coinmarketcap.com/currencies/monetha/#markets
Higher daily Volume = more popular exchange.