As mostly PHP, full stack web dev for 5 years I am looking to revitalize my career and change current job.

I always wanted to make computer and mobile games. However I am also looking for a useful language to write basically anything popular in todays job market.

I am deciding between C#, Java, and React framework.

C# or Java because its used almost everywhere and as a bonus you can write games in Unity or write native Java apps as a hobby.

React because you can write cross-platform Android and iOS apps, among other things.

What are your thoughts. I know the question is a bit vague but maybe I can get some first hand insight what is the most sought after skill these days. If possible provide some good learning resources .