Can you provide a different way for them to report bug issues? Perhaps a Google Form or through your social media? You could even have people report bugs just on the project page on itch.io.
You don't need to have an entire Discord just for bug reporting.
Right now I have two ways, on the itch page, and by mail (for those looking for something more private), and so far both ways are total silence, although the mail was added recently.
Also, if you are looking for people to bug check for you, it may be good to make a post specifically asking people to quality check your game. For example, you could post here or on reddit to ask for volunteers.
