Welcome to the community @Kelly_Johnson!
Unfortunately it’s going to be difficult to diagnose any change in bounce rate without a bit more information on the specifics of the site. Are you running paid advertisements or is this all from organic traffic? Are you using Google Analytics or some other metric tool? If you’re using GA, did you upgrade to the newest version?
Your analytics should give you an idea of the site performance so assuming that’s unchanged around the same time then I’d guess the bounces are either due to a change in how they’re measured or a tweak you made in advertising. If you’re lucky enough to get a bunch of organic traffic, then it’s possible that the site is now relevant for keywords that don’t accurately reflect the content of the site.
Admittedly I’m not too keen on analytic updates, but some quick research suggests that a bounce rate that low is due to an issue with the tracking data as typically something around 25-40% is considered “excellent”. That may also back up the changes to your site visits and page views, although I wouldn’t rule out some of my suggestions above.
Outside of that, it appears that Google is doing away with bounce rate in GA4 as they found it’s not an entirely accurate metric and instead replacing it with “Engagement”. I’m not sure if that relates to your situation, but it’s something to consider when digesting the site reports.
Hopefully that helps give a bit of insight, but keep in mind I’m by no means an expert—measuring analytics is a skill in and of itself. I’m happy to talk through anything else if you’ve got other questions/thoughts, but if this is causing a significant hit to your business it may be beneficial to chat with an experienced professional.