Mattress topper for rib pain

Hi,
I have a Helix Midnight luxe medium hybrid mattress. It is about 6 months old. I am having some rib pain and think that area of the mattress is a bit too firm. I am looking for a topper. I go between side and back. I have looked at the Saatva graphite, the Temperpedic ( had their mattress didn’t work). Would love some help. * side note have had 3 spine surgeries in the last 3 years. Thanks.