With a sell order open at 1.1, you can now even open a spot buy order at 0.9 in parallel, and you will pay the commission once the order is filled.

How long can I leave my spot order open?
Theoretically if I sold $ADA now at 1.1 usdt I can immediately open a spot order to buy at 0.90 usdt, to keep the order open until the day $ADA touches 0.90 would I pay a commission?