Keep in mind that if you trade on futures, and you are going long and your collateral is BTC, then your liquidation is when your average price goes down by half with 1x leverage. Because at 1 BTC at $10000, equals a 100% loss when that BTC is worth $5000 and price is trading at $5000. This is why you need to be careful. This is why btc had that black thursday due to long liquidations. Most bought at $8000.
We can never be sure what would be the outcome of the future price. Your calculations might even work but yet the price might quickly move in the opposite direction(which would liquidate your funds) and then rally onto the positive direction(which would be of no profit for you).