We have no control over what route a packet takes after it leaves our ISP. Routes do change. Yes, I agree, Level 3 is the worst backbone provider on the Internet. They are also the largest, which is unfortunate.
There is not a major metropolitan city in the U.S. where you could avoid Level 3, 100% of the time.
But, like what was already said, routes change. This time of year the Internet is always a mess. Nothing about that is gong to change either.
This thread has degraded to not being helpful, for anyone.