The issue with white label or turnkey solutions is they all look mostly the same with small changes on the UI in regards to theme & colors. You will barely come across a white-label casino that is making great margins with the number of loyalties and commissions involved. White-label solutions are also limited in what customizations they can offer. For instance, they won't offer Crash or other original games and would expect you to have that either integrated from a third party or pay huge development fees to get it developed in-house.

On the other hand, most of the famous casinos you see online have their in-house tech and a good team of devs, and designers to create games/game engines from scratch. This is the only differentiating factor you need. You can start by hiring in-house designers and developers who will create a "new" or more personalized UI for each client that you're shipping a new casino for. I'm not sure how if it's financially profitable for you as a company. It depends on the level of developers you hire and the budget your clients bring to the table.