I am traveling to Wuhan for four days. Would it be exaggerated if I brought a suitcase and then carried a small package of valuables?

Usually such equipment.

The carry-on bag contains ID cards, cameras, cash and other important items that are always ready for use.

Put some clothes, food, toiletries, etc. in the suitcase.

So, this kind of equipment is not an exaggeration, but your suitcase is not an oversized one.

In short, whatever suits you is fine.