what do yout think about a new game, which involves both luck and skill like poker? Is there already such an alternative on the market? The problem with poker is that it is already solved by algorithms. Sure, there are still some players, but not as much as in the old glory times...
Edit: I'm just regarding games that you can play PvP and not against a house-edge-casino..
I would say any card game that is known around the world could be used in a PvP setup. There a some competitive card games out there which have championships in my city, the only problem is that you only play it with 4 people. The attractiveness of poker is that you can sit with 10 people on one table and play for a lot of money. If you find no limit holdem to competitive you could try and go for different variants like Omaha for example.