I think 25x leverage is only okay if you're using a fund of around $10-$20 for futures trading. But if you're using $30 or more to take a position, whether long or short,
you'll surely get liquidated quickly if you make the wrong move.
That kind of leveraged trading is too dangerous with a large amount of funds. When I use $100, I only use a 5-10x leverage.
The amount of leverage directly depends on the size of the order being opened and the amount of margin that you have in your account. And if you open a position of $1,000 with $100, your position will be liquidated if the price deviates by 10%. But if you have a margin of 1000 bucks, and you open an order for the same 1000 dollars, then to liquidate your order, the price will need to change by 100%.