The only way to get rid of the drone is to switch out the exhaust or add a resonator, which adds expense and ruins the OEM exhaust if you want to sell it. You will be relieved if you just replace it. I was in the exact same boat you are.
I always wanted a 4runner so I bought a 2023 TRD Pro last year before they redesigned it. I wanted the 4 liter, etc. Anyway, we took it on a couple of road trips and HATED the catback exhaust drone. We are in our early 50's, so maybe we are just too old for it, but it drove us absolutely nuts at interstate speeds and rpms. It gave us a headache and we could not even hold a conversation. We loved everything else about the truck though. I finally had enough and at 5000 miles I put on a Magnaflow Overland exhaust. I went with it because it came with a resonator that you could install specifically to get rid of drone at highway speeds and the install is pathetically easy. We are at 15k now and far more satisfied with it than the TRD catback. The drone is gone and it still sounds good. Plus I have more clearance. Sold my OEM TRD exhaust in just a few days on FB market place for almost what the new Magnaflow cost, so all I was out was about $75 and the time it took for me to install it, which was about an hour. I think they have went up in price though now because they have gotten more popular. I bought mine for less than $700 and sold my OEM for just a little over $600. Some people really want that OEM with the black chrome tip.