How to copy from source workbook and pasting at first empty row in destination workbook

I am copying anywhere from 15-25 rows from 8 separate workbooks that I am merging into one workbook. Right now I just copy/paste them far enough apart and then delete the empty rows, but there must be a better way. Snippet of my code is this so you can see what I mean when I say I just paste them far enough apart so they can't overlap.

       aRng.EntireRow.Copy
        z.Sheets("Audit Tracker").Range("A5").PasteSpecial
        
        bRng.EntireRow.Copy
        z.Sheets("Audit Tracker").Range("A32").PasteSpecial
        
        cRng.EntireRow.Copy
        z.Sheets("Audit Tracker").Range("A62").PasteSpecial
       
        dRng.EntireRow.Copy
        z.Sheets("Audit Tracker").Range("A92").PasteSpecial
        
        eRng.EntireRow.Copy
        z.Sheets("Audit Tracker").Range("A122").PasteSpecial
        
        fRng.EntireRow.Copy
        z.Sheets("Audit Tracker").Range("A152").PasteSpecial
        
'        gRng.EntireRow.Copy
'        z.Sheets("Audit Tracker").Range("A182").PasteSpecial
        
        hRng.EntireRow.Copy
        z.Sheets("Audit Tracker").Range("A212").PasteSpecial

        z.Activate
        Columns("A:D").AutoFit
        
        Set Blk = Range("A4:A500").SpecialCells(xlCellTypeBlanks)
        Blk.EntireRow.Delete
        z.Save

Ah, that does make sense now doesn't it! I am slowing learning the Rows.Count and xlUp. I can use it for copying, but pasting was a new one. Thanks!