snappy9567

Hey. I have been riding a domane al3 for about 8 months now. I am riding on average 300 miles a week
I have been wanted to upgrade some on the components, but not sure what I can upgrade and what i shouldn't touch or bother with.
I want to upgrade handlebars to something aero and carbon but I am a small person and worry about leaver reach and comfort with small hands. Also, not trying the spend a lot of $$$$$
The Domane AL3 right now has the original Sora Group set, but I am not thrilled with it. Its a bit clunky. Should I move up to the 105 group set and how many components will I actually have to change out? I understand that the bike is mechanical disk brakes that works with the Sora but i don't think the breaks will work with the 105 group set? Will disk brake rotor, calipers, leavers, and hubs all have to be switched out?
I am mainly trying to lighten the bike and have a more aggressive ride style and speed.