Car will not start

Hi, a year ago I had an issue with the antifreeze leaking from the cylinder
head. I replaced the head gasket and had the head resurfaced. Though, by
accident, I polished the cylinder bores with a 1000 grit wet sand paper with
using wd40 and the grit I didnt clean damaged the piston rings, I think,
because one piston had a compression leak. I opened the engine's bottom,
removed and cleaned the pistons, installed new piston rings, replaced the
oil pump, primed the pump by hand, turned the crankshaft by hand, put
everything back, and started the car.
The car turned on smoothly, I didn't see a leak, hear a squeal, or notice a
compression leak issue. I didnt drive the car after it turned on because it
was late, I was tired, and I thought I had succeeded in rebuilding my
engine. When I tried to turn the car on the next day, it didnt start. I saw that
the serpentine belt wasn't moving while having my dad turn the key. I
replaced the battery, alternator, starter, and checked the fuses in case it
was an electrical issue; everything checked out fine.
At this point, is there anything I forgot to do? Can you help me?
I can turn the crankshaft using a breaker bar and elbow grease. The
crankshaft and camshaft sensors are new. the oxygen sensors are new.
The cat converter is new.