If you can find a container half the depth of what you currently have, or some bonsai containers which are shallow and wide, that would be good. If all you can find are deeper containers, just use fillers below, like styro peanuts in stockings, so it is easier to handle the styro later, they can get annoying. That way you are not using too much soil to fill the entire container. They rather like enough space to spread their roots more than going too deep, it really has a smaller root mass. That is why it can easily get overwatered if there is too much soil to dry out. So making the soil well draining and porous is what you will aim for.
Oftentimes, Crassula ovata would do a stage of lower leaf dry out, but it is actually redirecting its growing energy to new growth at the center tip of the rosette or anywhere up and down the stem and branches. So your ongoing maintenance is removing the dried out leaves, or trimming down overgrown branches that makes it too top heavy or maybe got etiolated due to light changes as our season change.
When you trim a branch, dab some cinnamon on the cut off end, it is a natural fungicide. Just the cut off ends, not on the the roots. As long as the main stem is staying hard and firm, it is okay.
