There is an element of sales involved, you need to have a strong value proposition and sell that to your clients. If your approach is so much better than React

There is an element of sales involved, you need to have a strong value proposition and sell that to your clients. If your approach is so much better than React Native, tell them what it gains them. How much money do they save, how much more performant is it, let them know how important their site speed scores are and then show them how a PWA fairs against a typical React Native site and so on.