SQL Server does not reduce the size of MDF and LDF files even though the file shrink process has been carried out

I am a SQL Server 2017 user, I deleted a table that had too many records, but after the delete process, the size of the MDF and LDF files did not decrease, but increased. I have shrunk the file but the file size remains the same. What should I do to change the file size? I want the mdf file size to return to normal according to the existing record