There should be tons of bikes in the 54 cm to 56 cm size
(that's center of bottom bracket to the top of the seatpost)
size that should fit you. I say start scouring local thrift/stores,
swap meets, etc. in widening circles looking for old vintage bikes
with decals that indicate the tubing. . .

But the Mercier/Flite is a fun bike if you go that route.