Is there any way to save my patterns to my PC so that I can have more space to create more patterns?
nope, unfortunately
embrace the temporary nature of jam-based music, imo. I know it's easier said than done, as when I had a po-12 I was hesitant to overwrite patterns, but it's really meant for on-the-fly production rather than building up a huge library of patterns/tracks
no problem! if you haven't checked it out already, the operator-1 forum is a good source of tips and tricks for all TE products: