Good luck with that. Graves was mainly picked for J6 prosecutions. He's going nowhere. He and his wife are quite hooked up in Dem circles and Biden is pleased with J6 performance. Doesn't seem like that work is ending any time soon.
The no paper rate actually began to tick up at the end of Obama's term, and increased over Trump and Biden's terms. Not just Graves per se.
Career prosecutors may also be a factor.
https://www.cnn.com/2020/09/04/politics/black-prosecutors-dc-gun-cases/index.html When Graves suspended prosecutorial discretion in a Chinatown pilot project for a time, rates went up significantly, all other things often cited as issues, being equal. Was noted in a WP article.
DOJ (and Congress with oversight capabilities over DOJ, NO hearings yet held re: DC USAO) could bring metrics for performance in line with public safety goals. and provide Graves with resources needed. No other USA does local criminal prosecution. Right now metrics for office penalize losing trials, makes sense re: management of resources if prosecuting other types of crime, incentive here to settle more.
DC juries are a real factor too though. In many cases a plead down sentence may be the best you can do. Of course, there are still all the no papered cases...