Possibly stupid question, but what is the reason you originally got into judo. Because that may affect what to do next. People have mentioned switching to a striking art, and I definitely second the arnis/escrima recommendation, IF that's what you're looking for. I guess what I'm asking is, what do you want to get out of whatever art you switch to?
Edit: The above post wasn't up when I posted mine. Apologize. I'm dumb.
In my humble foolish opinion that is a good ideal. Being on your feet is more dangerous. As long as you don't let anyone stack you, you should be ok.