Bitcoin price varies, it's true. You can gain or lose if you sell your bitcoins as all depends on the market. Store your bitcoins until the Bitcoin value increases and then sell to get profit. The present value is high compared to your Bitcoin price, you can get rich. Otherwise, you lose.
All depends on the market situations. If the market circumstances are so that bitcoin price is much higher than the value at which you bought it, selling bitcoin then will absolutely be so profitable. But selling bitcoins at value lower than your purchasing one just because you are panicked by unfavorable crypto market circumstances, is a mere loss. Good command over emotions plays crucial role in playing safe.