How to only execute onderlying macro's when cell value changes

Hello, I hope someone can help me because I seem to be screwing up more than I should be.

I have made an excel sheet which shows or hides a graphs based on the value of a cell
if: "deze maand" then show graph 1 and hide graph 2.
if: "Dit jaar" then show graph 1 and 2.

In order to make this work automatically, I have also made a macro that changes a cell fill colour when either cell values are correct.
This because excel seems to need an action in order to update the changes.

The problem is that now that on any other cell changes, the Both macro runs. Deleting its history and making it impossible to use the "Undo" button.

Is there any way I can adjust this code, so it first checks if there are any changes in cell a3, before executing the underlying steps.
This so that the undo button is still in function and the cell fill action is only executed when the correct cell value changes (through a drop-down menu)

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Private Sub Worksheet_SelectionChange(ByVal Target As Range)

If Range("T6").Value = "Deze maand" Then
          Sheets("Overview").ChartObjects("Grafiek1").Visible = True
            Sheets("Overview").ChartObjects("Grafiek2").Visible = False

ElseIf Range("T6").Value = "Dit jaar" Then
            
         Sheets("Overview").ChartObjects("Grafiek1").Visible = True
            Sheets("Overview").ChartObjects("Grafiek2").Visible = True
                        
     End If
End Sub

Sub worksheet_change(ByVal Target As Range)
Set Target = Range("T6")
If Target.Value = "Deze maand" Then
 Call DezeMaand
End If
If Target.Value = "Dit jaar" Then
Call DitJaar
End If
End Sub

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I really hope someone could help with this, it's the last step of the process before I can send it out :-(

Thanks in advanced!

Maybe the change event only:

Sub worksheet_change(ByVal Target As Range)
If Target.Address="$T$6" Then
If Target.Value = "Deze maand" Then
Sheets("Overview").ChartObjects("Grafiek1").Visible = True
Sheets("Overview").ChartObjects("Grafiek2").Visible = False

ElseIf Target.Value = "Dit jaar" Then
Sheets("Overview").ChartObjects("Grafiek1").Visible = True
Sheets("Overview").ChartObjects("Grafiek2").Visible = True
End If:End If
End Sub

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You're welcome amd thanks for the rep!

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