Thats bigger incrase from 2018, by exactly 14,9%.

Some people claim May 05 was bigger but most media still take todays date. Whatever the date is (as they are close) means more and more people wanna mine BTC on this "cheap" price, means it should go up.

Where to mine?

Well if you are clueless than Minergate as it can mine even on worst comp, if you have good comp registyer to Binance and uses their 50% promo pool - 50% Off on Fees For New Binance Pool Users.