Bitcoin mining current year 2018

In Oct 17 i purchase contract from console.pool.bitcoin.com and i get daily profit equal to 6 dollar, i am happy but not so much. In December bitcoin price reach 19500 US Dollar and i get 20 dollar daily, but now current month (June 2018) i get only 0.5 dollar daily according to bitcoin mining difficulty and bitcoin price rate, its so low and i can not get my total investment amount,
Cloud mining sites are offering bitcoin contract but your do not understand what they do with you, if bitcoin miner price 1000 dollar, the price of 1 TH speed is 71 dollar but company charge to 140 dollar for 1 TH speed including service and maintenance charges,
Today mining contract purchasing is bad investment, i recommend you to trade in crypto currency, purchasing and holding only.