That sounds really bad if I read it correctly that you have not had an update since May?!?
Assume you have a Note 20 Ultra? What country are you in? Where did you get your phone from. What is your CSC? Perhaps you could post a screenshot of the Settings>About Phone>Software Information.
Without sounding rude, you have checked under Software Update>Download and Install to see if there are any updates?
To be honest, I would not worry too much about the beta right now, I would get your device updated with up to date Software with the latest Security Patch first. With the questions above, hopefully we can help a little more. Thanks! Mark.