Once you have passed the 30-day mark, you cannot transfer the reservation. If you are truly having significant issues with your TA, you could probably ask to have the reservation returned back to you, but the TA would have to be amenable which can be a challenge. However, you would not be able to pass it along to another TA unless you are still within the 30-day period. So sorry you have have difficulties with your TA.
Enjoy your cruise!