Low mileage maintenance

Question about routing maintenance on my '02 M3 with 25k miles.

So far I've done all of the maintenance that the book recommends. Stuff like at least yearly oil changes, radiator flushes, brake fluid. I'm concerned that this alone isn't enough to keep it in good operational shape.

I've had it since new and don't plan to sell it anytime soon, so to keep it running should I be looking to replace certain things at certain times on my schedule?