What do you think should i Invest and how much money will i make per day If i dont pay electricity !! I dont need to pay electricity in my country at all what kind of hardware should i buy and how much will I earn for day
Forget about electricity. As franky1 said, buy and hold. Don't burn your 50k now as the price is expected (?) to go lower. You can buy e.g. 10k a month for some time.
In theory, a lower price of bitcoin would mean a lower difficulty (or potentially a lower rate of growth in difficulty) which would mean a higher rate of return for any miner that is purchased (as it would generate greater amounts of bitcoin).
It is very difficulty to predict accurately the direction that bitcoin will trade over the short term