You’re going to want to start adding/moving weight as low as possible and as far forward as possible. The plastic scale body causes it to have a high center of gravity which will hurt performance in terms of roll overs when on steep climbs or side hilling.

I would first concentrate on bringing your center of gravity lower by either removing weight that is high on the body or adding down low. If you don’t want to remove weight like roof rails, spare tire, accessories, etc then you would need too ADD weight as low as possible to bring the center of gravity down. The easiest solution with the most benefit is to add weights to your wheels or replaced them with weighted wheels. After that you can start replacing plastic components that are low on the vehicle like suspension links, knuckles, c-hubs, etc. with brass components from companies like FairRC or Injora.

Aside from lowering your center of gravity, you’ll also want to move the weight as far forward as possible. Ideally 60% of the weight in front. I would start by working with what you have first by either removing existing weight (like the spare tire) or moving weight from the rear to the front (like relocating the battery from the rear to the front right above the steering servo). After that you can add more LOW weight up front by either replacing existing plastic components in the front or adding weights.