2007 Jeep Liberty carbon buildup

Engine Performance problem
2007 Jeep Liberty 6 cyl Four Wheel Drive Automatic 117K miles

I m smelling my catalytic converter with this many miles, will this cause back flow in my moter to help with carbon buildup? I use cleaner all the time and still get carbon buildup

I drive about 2 k a week or more when I work ( I m a pilot for oversize truckloads ) I buy all kinds of gas but get less buildup with Shell gas

I m thinking of replaceing my cataalytic converter to get better air flow. Do you think this will help?

A lot of people with the 3.7 motor tell they have this problem with carbon buildup and can ben a valve