After learning JavaScript and Python, there are several popular languages that you can consider based on your interests and career goals. Here are a few options:

1. C#: C# is a language developed by Microsoft and is heavily used for building Windows applications, web development with ASP.NET, and game development using Unity. It has a syntax similar to Java and offers strong support for object-oriented programming.
2. Java: Java is a widely used language known for its versatility, performance, and extensive libraries and frameworks. It is commonly used for building enterprise-level applications, Android development, and server-side development. If you are interested in learning Java then Java Training Course in Lucknow is also the right place. 
3. Ruby: Ruby is a dynamic, easy-to-learn language that focuses on simplicity and productivity. It is commonly used for web development with the Ruby on Rails framework and is known for its elegant syntax and developer-friendly conventions.

Ultimately, the best language to learn after JavaScript and Python depends on your specific interests, career aspirations, and the type of projects you want to work on. Consider exploring the requirements and job opportunities in your target industry or domain to make an informed decision. Learning multiple languages can also broaden your skill set and make you a more versatile developer.