If my father has been in jail for 3 1/2 years now on alleged crimes and has not even been convicted yet, what should we do?

we have a public defender, on most all of his court dates they either get postponed because of the prosecutor needing more time, or evidence not in, basically this is a disappointing roller coaster and we really want to get off. He is being accused of rape and impersonating a police officer. My dad had a gun and a permit for it but not a permit to carry and he left the house with it and was intoxicated. He was also a special agent, hence the badge and other stuff he carried, all legal.