Compression Check low oil pressure Now What?

I appreciate the suggestions but.........I would like some explanation...........cause I don't understand why the opinions were given.

Is 135-140 low? If so what should it be...the manual says above 100psi.

Do worn cam bearings cause low oil pressure? If so can I just replace them?

What does lower end worn out mean?...Is that new bearings or a rebuild?

How about some schooling from a technical angle. Because at this point I don't know what to do. Can I fix this or should I be looking for a new engine? I see some questions getting numerous answers or are my questions just dumb? Help me out here please.

Craig