Dear @Karthik.Prakash,
A similar question regarding scaling was discussed previously in this forum, e.g., here: 2.5 MW WT.
The OpenFAST r-test (GitHub - OpenFAST/r-test) provides several OpenFAST models of different sizes. The IEA Wind Task 37 repository contains a few other reference models: IEAWindTask37 · GitHub.
Best regards,