I think 20A is plenty for upstairs. 60A for whole house is common.
However, there are several options for upstairs.
One 20A radial, two 20A radials, one 32A ring, one 32A radial, two 32A radials etc.
The ring is not the only alternative nor bee-all and end-all, but if you already have a 20A radial to all of the upstairs then converting it to a ring would probably only involve the addition of a relatively short length of cable.
However, there are several options for upstairs.
One 20A radial, two 20A radials, one 32A ring, one 32A radial, two 32A radials etc.
The ring is not the only alternative nor bee-all and end-all, but if you already have a 20A radial to all of the upstairs then converting it to a ring would probably only involve the addition of a relatively short length of cable.