Using IPA to clean the plate is good for between prints on a clean plate to get off any microplastics residue, but not good for cleaning off any oils left from touching it with your hands. In fact, the IPA can hurt by just spreading the oil around. When you are getting adhesion issues, it is time to wash the plate with dish soap and hot water.
Drying the filament means heating it up. The desiccant in the AMS just helps to maintain a low moisture environment, not actively dry what is stored in it. PETG is ideally dried between 60-70c and most home ovens don’t go that low. You can use an inexpensive filament drier ($40-60 on Amazon), a food dehydrator, or your P1S also has a filament drying cycle like the X1 does where you print a cover with holes (or just use a cardboard box top with some holes poked that fits over the filament to trap heat) where the printer uses the heated bed to dry the filament