My Kia Sorento 2013 is slipping gears and not shifting correctly?

What is your question?

When driving up hill car revs to high rpms and gains slowly.i already did a trans fluid flush and was a little low but not terrible and the fluid came out champagne red color. Top the fluids back up and still having slipping and shifting problems

What makes this problem better or worse?

It’s worse when over 35 mph

How long has your 2013 Kia Sorento had this problem?

A Week and half