I assume you are in the U.S. You need a new lawyer if the current one can't/won't fight for 50% custody for you. Unless you have a criminal record or your wife has actual evidence of any abusive behavior.
If she's just making accusations, they are just that, and a lawyer with any competence should be able to deal with that.
I believe you mentioned making a multiple-six-figure salary. You should be able to afford a very good divorce attorney.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final