We won’t sugar coat things for you. You will never get a high-quality, professional-sounding drum set from an entry-level kit, no matter how many upgrades you make. This is mainly due to the wood that is used in entry-level drum shells, which is primarily poplar, or a similarly affordable option. Pro-level kits use high-end maple or birch which instantly gives it a more polished sound.
Entry-level options also have entry-level cymbals, and heads, which affect the sound. The bottom line, these all-in-one sets aren’t in the same league as kits that are 2-3 times their price. But that doesn’t mean they are garbage. Their role is an important one in the drumming community: helping beginners learn the basics.