Buoyancy system wave

Hello, i hope you can help me with this problem. I wrote a buoyancy system with waves, but i have a problem for synchronize waves and buoyancy.

I would like that the object go up and down with wave's movement and continue with buoyancy.

This is for waves

 private void wave()
     {
         if (GetComponent<MeshFilter>() != null) {
             Mesh mesh = GetComponent<MeshFilter>().mesh;
 
             Vector3[] vertices = mesh.vertices;
 
             for (int i = 0; i < vertices.Length; i++)
             {
                 Vector3 globalPosition = transform.TransformPoint(vertices[i]);
 
                 Vector3 globalPositionVertexProject = projectPointOntoSurface(globalPosition);
 
                 Vector3 localPosition = transform.InverseTransformPoint(globalPositionVertexProject);
 
                 vertices[i] = localPosition;
             }
 
             mesh.vertices = vertices;
 
             mesh.RecalculateNormals();
             mesh.RecalculateBounds();
         }
     }
 
     private Vector3 projectPointOntoSurface(Vector3 globalPosition)
     {
         return new Vector3(globalPosition.x, GetComponent<Collider>().bounds.max.y + waveAmplitude * (waveLogic(globalPosition) - 1.0f), globalPosition.z);
     }
    
     public float relativeHeightAtPoint(Vector3 globalPosition)
     {
         return GetComponent<Collider>().bounds.size.y + waveAmplitude * (waveLogic(globalPosition) - 1.0f);
     }
 
     private float waveLogic(Vector3 globalPosition)
     {
         return Mathf.Sin(globalPosition.x * 0.5f + Time.time) * 0.8f + Mathf.Sin(globalPosition.z * 0.5f + Time.time) * 0.2f;
     }

This is for buoyancy

 void FixedUpdate()
     {
         wave();
 
         foreach (KeyValuePair<string, WaterObject> entry in elements)
         {
             foreach (Vector3 position in entry.Value.voxels)
             {
                 Vector3 globalPosition = entry.Value.collider.transform.TransformPoint(position);
                
                 if (globalPosition.y < waterLevel)
                 {
                     float k = (waterLevel - globalPosition.y);
 
                     if (k > 1)
                     {
                         k = 1f;
                     }
                     else if (k < 0)
                     {
                         k = 0f;
                     }
 
                     float archimedeForce = waterDensity * Mathf.Abs(Physics.gravity.y) * entry.Value.volume;
                     Vector3 archimedeLocalForce = new Vector3(0, archimedeForce, 0) / entry.Value.voxels.Count;
 
                     Vector3 velocity = entry.Value.rigidbody.GetPointVelocity(globalPosition);
                     Vector3 damping = -velocity * 0.1f * entry.Value.rigidbody.mass;
                     entry.Value.force = damping + (Mathf.Sqrt(k) * archimedeLocalForce);
                    
                     //float rp = relativeHeightAtPoint(globalPosition);
                     //entry.Value.force.y = entry.Value.force.y - ((waterLevel - rp) * 2);
 
                     entry.Value.rigidbody.AddForceAtPosition(entry.Value.force, globalPosition);
                 }
             }
         }
     }

Thanks for your help!