Hello ILYA Giri,
You may need to perform mesh convergence study over here with different mesh sizes and check when you are getting not much distinctive frequencies.
The frequency is dependent on the stiffness. The stiffness of an element is dependent on the size of the element. (This is especially true when the model is thin and bending: Just a sidenote).
You may find bellow articles useful in this context:
Why does the mesh size affect my modal analysis results? (ansys.com)
(PDF) Effect of Mesh Size of Finite Element Analysis in Modal Analysis for Periodic Symmetric Struts Support (researchgate.net)
finite element method - Why does the mesh size affect my modal analysis results? - Engineering Stack Exchange
Correct mesh size - a quick guide! - Enterfea
How to decide mesh size of larger model in the modal analysis - Autodesk Community - Inventor Nastran
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