thanks for your query.
A 23 mm fibroid
, that too subserous is quite harmless.
If it does not cause you any symptoms such as pain, bleeding etc, then do not worry.
At 48, wait it out, as most such small fibroids regress after menopause
You do not need any surgery for the same.
Also, fibroids do tend to recur after surgery, but it depends on a lot of factors.