Modify your nickname or personalized signature to something related to Buddha, or directly write something like "Don't add it to those who are not Buddhists". Others will know your name at a glance. Whatever your hobbies are, people with the same hobbies will naturally join you.

Similarly, there are others who have done this, and you can also find them by viewing the attachments.

Also, you can first find a Buddhist QQ group or WeChat group, add friends with similar interests to the group, or ask them to add you on WeChat.