There’s two types of reset: (1) Factory Reset and (2) Data Reset. Factory Reset should be used if you’re moving and need to install Sense on a brand new panel, or if you sell your Sense monitor. Data Reset on the other hand will just reset your Sense data. It sounds like you’d want the latter.
I’ll let others chime in on their experiences with doing a data reset, but can I ask what you hope to gain by doing so? It will reset everything, so you will be starting completely fresh. I’d recommend exporting all of your data via the Web App first, if you want any form of historical lookback.