What's your goal? Do you want to test whether your update works correctly on many devices? Do you want to get ideas for new features? How many users do you have?
I have about 10,000 active users. I don't do much testing. I test myself on an Android device and an iPhone. Since my app is built with Ionic and based on Cordova, it works anyways and real crashes are not to expected.
Feedback is easy: I just wait until people write me an email. It's funny: Sometimes, you don't hear about a feature request or some issue for months. Then 2-3 people write you within a day. Then nothing again.
Back when I started, I implemented a lot of features. Now I basically reject almost every feature request, unless it comes up extremely often in emails. I sometimes take notes, but most of the time, I type a quick reply, thanking for the suggestion, archive the email and only try to get a feeling for what people want.
Obviously, this has its limits, but since I know my core users and what they want, it works for me.
If there's a serious bug, people will let you know soon enough.