Return to userform after msgbox?

I want to return to the userform if the msgbox occurres (then a text / listbox is empty) so the textbox can be filled before populating the data to the worksheet.

Can anyone help me please?

Private Sub CommandButton1_Click()

If ListBox5.Value = "" Or ListBox1.Value = "" Or CheckBox1.Value = False And CheckBox2.Value = False Or ListBox3.Value = "" Or ListBox6.Value = "" Or ListBox7.Value = "" Or TextBox3.Value = "" Or ListBox2.Value = "" Or TextBox1.Value = "" Or TextBox2.Value = "" Or TextBox4.Value = "" Or DTPicker1.Value = "" Then MsgBox "Please fill in all content"

    Worksheets("Data").Range("A3").Value = ListBox5.Value 
    Worksheets("Data").Range("B3").Value = ListBox1.Value 
    Worksheets("Data").Range("C3").Value = TextBox6.Value 
    Worksheets("Data").Range("E3").Value = ListBox3.Value 
    Worksheets("Data").Range("F3").Value = ListBox6.Value 
    Worksheets("Data").Range("G3").Value = ListBox7.Value 

        If CheckBox1.Value = True Then
        Worksheets("Data").Range("H3").Value = "YES"
        End If

        If CheckBox2.Value = True Then
        Worksheets("Data").Range("H3").Value = "NO"
        End If

    Worksheets("Data").Range("I3").Value = TextBox3.Value 
    Worksheets("Data").Range("J3").Value = ListBox2.Value
    Worksheets("Data").Range("L3").Value = TextBox1.Value 
    Worksheets("Data").Range("M3").Value = TextBox2.Value
    Worksheets("Data").Range("N3").Value = TextBox4.Value 
    Worksheets("Data").Range("O3").Value = DTPicker1.Value 
    Worksheets("Data").Range("P3").Value = TextBox7.Value 


    Unload Me
    Worksheets("Overview").Select
    Range("A2").Select
End Sub