My strategy is simple, buy when the price goes down and sell when the price goes up. I do a 50/50 split keep fiat on an exchange incase price moves to levarage against bitcoin dropping. The bitcoin I have on localbtc

What is the fastest way in cashing out bitcoins?

the best option is always selling it locally, you can use the popular site like localbitcoins or depending on your country you might find better offers in your country by googling or searching on some other forums related to your country. taking cash or receiving the money directly to the bank is options to think about.