If giving money back to both Celsius and ftx would make you insolvent, you are unlikely to be required to go into debt to repay both bankruptcy estates of Celsius and ftx.

Even if you were required to repay certain amounts withdrawn, you would likely not be required to repay the full amount. Rather, offsetting would likely be used so you repay what you would have been clawed back, minus what you would receive after assets are distributed.

My suggestion is to contact a qualified attorney who can give you advice for your specific situation.