can you trade your lease for another lease for less monthly payment
People exchange leased cars all the time. You'll probably need a dealer to do this, or a lessor that is used to doing this. In the transaction, the lease on your car is paid off along with any penalties for early cancelation. You then replace your car with a less expensive car with a lower lease payment and the dealer or institution will do all of this for you. Of course, what you lose canceling the lease on your current car will probably be substantial.... If you're actually asking if you can cancel the lease on your current car and replace that with a lease on the same car that generates lower payments; that's not likely to happen, or if you can find a source to do this (REALLY doubtful), the cost will involve paying the penalties on the existing lease and paying down the principle..... In either case, it can be quite expensive.
I doubt you would end up saving anything.