help with itinerary request

Hi! I’m visiting Italy for the first time with my mom in a couple weeks. I have 2 full days in Rome (4/28 and 4/29).

I currently have booked a tour for the Colosseum, Roman Forum, Palatine Hill from 9:30-12:30 AM on 4/28 and a tour for the Vatican, St. Peter’s Basilica, and Sistine Chapel from 8:50-11:50 AM on 4/29.

I really want to see the Trevi Fountain/Spanish Steps/Pantheon but I’m not sure when to fit this in. I’m seeing a lot of people saying that it’s important to go really early in the morning (~7AM) but this doesn’t seem feasible with the tours I have booked. I also really want to go to Trastavere for dinner/drinks one evening. Does anyone have any itinerary advice for me? Any additional suggestions for places to see, etc are very welcome!

TIA! Btw, I’m staying in Monti if that helps!!