I have found this link to be very useful on MANY occasions.
https://www.thespreadsheetguru.com/blog/2014/7/7/5-different-ways-to-find-the-last-row-or-last-column-using-vba
Ways To Find The Last Row
Sub FindingLastRow()
'PURPOSE: Different ways to find the last row number of a range
'SOURCE: www.TheSpreadsheetGuru.com
Dim sht As Worksheet
Dim LastRow As Long
Set sht = ActiveSheet
'Using Find Function (Provided by Bob Ulmas)
LastRow = sht.Cells.Find("*", searchorder:=xlByRows, searchdirection:=xlPrevious).Row
'Using SpecialCells Function
LastRow = sht.Cells.SpecialCells(xlCellTypeLastCell).Row
'Ctrl + Shift + End
LastRow = sht.Cells(sht.Rows.Count, "A").End(xlUp).Row
'Using UsedRange
sht.UsedRange 'Refresh UsedRange
LastRow = sht.UsedRange.Rows(sht.UsedRange.Rows.Count).Row
'Using Table Range
LastRow = sht.ListObjects("Table1").Range.Rows.Count
'Using Named Range
LastRow = sht.Range("MyNamedRange").Rows.Count
'Ctrl + Shift + Down (Range should be first cell in data set)
LastRow = sht.Range("A1").CurrentRegion.Rows.Count
End Sub
Ways To Find The Last Column
Sub FindingLastColumn()
'PURPOSE: Different ways to find the last column number of a range
'SOURCE: www.TheSpreadsheetGuru.com
Dim sht As Worksheet
Dim LastColumn As Long
Set sht = ThisWorkbook.Worksheets("Sheet1")
'Ctrl + Shift + End
LastColumn = sht.Cells(7, sht.Columns.Count).End(xlToLeft).Column
'Using UsedRange
sht.UsedRange 'Refresh UsedRange
LastColumn = sht.UsedRange.Columns(sht.UsedRange.Columns.Count).Column
'Using Table Range
LastColumn = sht.ListObjects("Table1").Range.Columns.Count
'Using Named Range
LastColumn = sht.Range("MyNamedRange").Columns.Count
'Ctrl + Shift + Right (Range should be first cell in data set)
LastColumn = sht.Range("A1").CurrentRegion.Columns.Count
End Sub