My wheels and tires were probably my best upgrade. I stuck with Honda branded wheels, using the 20" black ones from the 2018 Pilot, 20x8j, 55 offset. I added 255/50 Michelin Defenders and have really appreciated the ride quality and it is as quiet or better than stock. It looks better! I retained the stock 18" wheels for some winter Blizzaks. This rig will truly amaze you in the snow and ice with studless ice tires like these.
If I did the wheels now, I would opt for the latest 20x8.5 rims from the 2019-20 Passport and would probably try a 265/45 like the new Michelin Pilot Sport 4 SUV (can you tell I'm a Michelin fan-boy?). This setup might give better turn-in feel.
I added the BAK Revolver tonneau cover and BedRug bed liner. Both great add-ons.
I also added a VanTech USA P-3000 ladder rack system. The adjustable racks are very versatile and slide on and off easily. I don't have them on 98% of the time - only when I need them.
I installed rear door checkers that allow wider opening and a rear tailgate lock, but your 2020 already has these upgrades!
The latest change is the much-debated device that disables the factory variable cylinder management (3 cylinder mode). I knew that this system was suspect on pervious versions of the Honda 3.5 and felt that it was sometimes noticeable on the RL with odd vibrations and slow throttle response off cruising speeds. I got the one known as S-VCM. It does the trick with regards to the symptoms and hopefully will help my engine last longer... Do your own research but be prepared for a long, dark rabbit hole!