how to solve slow p2p connection on turnserver using webrtc?

Question

I've created the video Call App for using webrtc and also using turn server for p2p connection,

Sometimes TurnServer not working properly

in a P2P connection, User A Wants to connect the UserB, and the socket Server received the data, but

UserB Video Doesn't show by UserA &&

UserA Video Doesn't show by UserB

I refer to creating turn server using coturn

https://gabrieltanner.org/blog/turn-server/

how to resolve it? Thanks