Don't feel too bad... I'm in the same boat regarding the enthusiasm lately. I used to have a great friend that was heavy into the RC world. We would crawl, create courses, innovate, modify, etc, etc. But over the last couple years we became pretty disconnected and then he dropped out of the picture completely. That left me with just my wife and needless to say, it's just not the same. She has zero interest in my hobbies and although I understand, it doesn't make the loss of my best mate any less unfortunate. I still do the RC thing and just run solo but it certainly took a big chunk of the fun away. Anyway... It is what it is.
So regarding the roof rack... I'm all for scale realism and personalizing rigs to look like the real thing. Accessories are insane these days in terms of all that's available so it sometimes gets overwhelming to not go overboard but regarding the cargo rack/ roof rack, I personally would run the rig without it. There's a point where you have to consider performance over accessorizing and with a metal rack being so high above the chassis, you would likely see a huge improvement in handling, stability, and overall ability if you remove the rack.
I wouldn't worry about the body and in-fact, I feel like all the scrapes, rash, dings are one of the coolest and most real looking "modifications" that you can make lol. Shows that the rig gets driven hard and isn't a shelf-queen. Once you get some wear & tear on that body, the rest come much easier.
I'll add to this that you may actually do less damage to the body not having that metal cargo rack on there anyway. The vehicle will be more inclined to stay put without being so top-heavy and potentially flipping over.
Anyway... best of luck and I hope that you're able to find some fun and solace in running your rig and working on it. I still do and I'm finding some benefits of running solo. I still find it relaxing and rewarding to a degree.