Hi @Naresh Kapa,
Since most of the classic web parts are not available in the modern experience. I would recommend you to transfer the web part into spfx. Here is the document about spfx
https://learn.microsoft.com/en-us/sharepoint/dev/spfx/sharepoint-framework-overview
And if you want to transfer the web part to spfx you could refer to the following video
https://www.youtube.com/watch?v=OLN--qHnFDs
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