I know Splendor has an expansion. Most expansions add complexity so I’m not sure if that’s exactly what you’re looking for. It sounds like you want something that is similar in complexity and play style. A few alternatives to Splendor that come to mind are:
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Jaipur - It’s probably worth looking at Jaipur if you like Splendor. I’d say the main difference here is Splendor is very much about building an engine for the late-game, while Jaipur is more of a drafting game where you push your luck every turn. It is ONLY 2-player though.
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Azul - If you Splendor, then you will absolutely love Azul. It’s an excellent as a 2-player board game that has very similar mechanics. You purchase tiles from suppliers. Specific patterns and sets of tiles earn you more points.