Ask someone to help me how to call my uncle.

Don't be too nervous. In fact, you can treat your uncle like a mother, and you don't have to call him to chat. This is gonna be awkward. You can call to say hello during the holidays and wish you a happy holiday. You can also send some blessing messages.

Usually, you can call me to talk about your recent situation, ask your uncle if he is busy with his work ~ whether his life is tight ~ whether he has much entertainment ~ or you can ask him to pay more attention to his health, maintain more and drink less. I don't know if your uncle has children, but if he does, you can ask him. If he is an adult, he is most concerned about his children, and he will be very willing to talk to you about them. Actually, there are many topics. Don't be too nervous, be natural, start the conversation with greetings, and your uncle will take the initiative to chat with you.