What if you open a full custody court case and you can’t afford to do the final hearing, can we push the trial date out?

We opened the lawsuit back in November to get my husband’s full custody of children living in (Florida) that our counsel has been very difficult to deal with and is asking us to pay him $20,000 in full before our December three-day trial … I’ve been out of work with Covid, so saving $20,000 right now is just not realistic. What are our choices for holding the case open while still not getting the final hearing? We are fighting in Georgia for the trial to be held in Florida under Florida law while the children reside in Florida.