How to add data below existing data on sheet? - vba

Question

I recorded a macro and edited it. It scrapes particular data from webpages (found on links) and display them on separate pages.
I want to use the data (VLOOKUP) but the data is on different pages which makes it hard to get an accurate formula.
Every week I change the second line of the code
For x = 1 To 20
to
For x = 21 to ....
for example, because new links/data come out every week.
How do I find the last line to add the next lot of data below that?
Sub Update()
For x = 1 To 20
Worksheets("Links").Select
Worksheets("Links").Activate
mystr = Cells(x, 8)
mystr2 = Cells(x, 15)
Worksheets.Add(After:=Worksheets(Worksheets.Count)).Name = x
With ActiveSheet.QueryTables.Add(Connection:=mystr, Destination:=Range("$K$1"))
.Name = "report2_1"
.FieldNames = True
.RowNumbers = False
.FillAdjacentFormulas = False
.PreserveFormatting = True
.RefreshOnFileOpen = False
.BackgroundQuery = True
.RefreshStyle = xlInsertDeleteCells
.SavePassword = False
.SaveData = True
.AdjustColumnWidth = True
.RefreshPeriod = 0
.WebSelectionType = xlAllTables
.WebFormatting = xlWebFormattingNone
.WebPreFormattedTextToColumns = True
.WebConsecutiveDelimitersAsOne = True
.WebSingleBlockTextImport = False
.WebDisableDateRecognition = False
.WebDisableRedirections = False
.Refresh BackgroundQuery:=False
End With
Range("A1").Select
With ActiveSheet.QueryTables.Add(Connection:=mystr2, Destination:=Range("$A$1"))
.Name = "report6_1"
.FieldNames = True
.RowNumbers = False
.FillAdjacentFormulas = False
.PreserveFormatting = True
.RefreshOnFileOpen = False
.BackgroundQuery = True
.RefreshStyle = xlInsertDeleteCells
.SavePassword = False
.SaveData = True
.AdjustColumnWidth = True
.RefreshPeriod = 0
.WebSelectionType = xlAllTables
.WebFormatting = xlWebFormattingNone
.WebPreFormattedTextToColumns = True
.WebConsecutiveDelimitersAsOne = True
.WebSingleBlockTextImport = False
.WebDisableDateRecognition = False
.WebDisableRedirections = False
.Refresh BackgroundQuery:=False
End With
Next x
End Sub

Answer 1

instead of
for x = 1 to 20
do
for x = Range("A" & Rows.Count).End(xlUp).Row to Range("A" & Rows.Count).End(xlUp).Row-20 step -1
which will find the last cell used in Column A and subtract 20 rows from it and iterate backwars