TPS Rotation Camera (similar to WoW or any other mmo)

Hello there, well i am currently programming a third person viewed social game and i somehow cant get my camera to do what it should do!

i want it to be controlled by mouse Y axis moves it should rotate around the character up and down, left and side for the X mouse axis... similar to pretty much any mmo for example World of Warcraft (just the camera)

ive used the rotatearound command to let it rotate which worked fine for the X mouse movement it rotates perfectly aroudn the character but the Y just doesnt want to work... it only rotates if im looking at the back or at the front of the character...

actually i thought of an idea of how i could get it to work but unfortunaly it didnt work that way... heres my code so far

     cameraTransform.RotateAround(_target.position, Vector3.forward, Input.GetAxis("Mouse Y")*Ymousesensitivity*((180-cameraTransform.eulerAngles.y)/90));
     
     cameraTransform.RotateAround(_target.position, Vector3.right, Input.GetAxis("Mouse Y")*Ymousesensitivity*((90-cameraTransform.eulerAngles.y)/90));
     
     cameraTransform.RotateAround(_target.position, Vector3.up, Input.GetAxis("Mouse X")*(Xmousesensitivity*0.75));
     
     
     
     cameraTransform.eulerAngles.z = 0;
     cameraTransform.LookAt(_target);