At 2 a.m., my phone kept vibrating.

A brother from the Northeast sent several voice messages, his voice changed: "Brother Xin, I have 10k USDT, full position with 10x leverage, only a 3% pullback, and my account is gone?"
I asked him to send the records, and I saw he went all-in with 9,500 USDT, using 10x leverage, no stop-loss.
A 3% pullback just wiped him out.
Many people think "full position = more resistant to drops." Wrong.
Using full position incorrectly is even faster than with isolated margin.
Let's do the math:
For a 1,000 USDT account, using 900 USDT to open a 10x position, a 5% opposite move will liquidate.
The same 1,000 USDT, using only 100 USDT to open 10x, a 50% opposite move will liquidate.
The key to full liquidation isn't how many times you leverage, but how much principal you put in.
I've played full position for half a year without liquidation, with just three rules:
First, no single trade exceeds 20% of total funds.
For a 10k USDT account, at most 2,000 USDT per trade.
Even if you misjudge and set a 10% stop-loss, you only lose 200 USDT, and the principal remains.
Second, single-loss per trade doesn't exceed 3% of total funds.
Using 2,000 USDT at 10x leverage, with a 1.5% stop-loss, you lose 300 USDT.
Even if you make this mistake three or five times in a row, you can still handle it.
Third, don't trade during volatility without a signal, and don't add to winning positions.
Only trade when the trend is clear.
After opening a position, never add more; adding more stirs emotions.
Full position's real purpose is to give you room for error, not to gamble your life.
A fan once had a liquidation every month, but after following these three rules for three months, his 5,000 USDT grew to 8,000 USDT.
He said something I still remember: "I used to think full position was gambling my life, now I realize, full position is to live more steadily."
In the crypto world, it's never about who makes the most in one shot, but who can stay at the table longer.
What do you think?