Overall, there's no problem setting the liquidation price above 4000. I personally use cross margin, and at the same time, I use another small account to open isolated margin positions.

The reason I require you to use isolated margin is to prevent sudden events. In other words, after entering 40% of your position, you can just leave it as is, and use the remaining funds as margin top-up if needed.

Theoretically, those following the trade should have only entered 30% of their position: 10% at 3090, and another 20% around 3250, totaling 30%. The rest can be used to top up margin.

In other words, I opened a 10% position at just over 2900 to show you my confidence. If you still can't keep up after this, then there's nothing more I can do.