Google Sheets script, find next row

Hello, I have the following script for a google sheets. I would like the row of data to be copied down to the next available (empty) row and then the original data to be cleared, ready for the the next input.

function saveButton() {
  var ss = SpreadsheetApp.getActive();
  // [START modifiable parameters]
  var sourceRange = ss.getRange('Active Jobs!A2:F2');
  var targetRange = ss.getRange('Active Jobs!A3:F3');
  // [END modifiable parameters]
  sourceRange.copyTo(targetRange);
  ss.toast('Data copied to ' + targetRange.getSheet().getName() + '. ' +
    'To undo, press Control+Z (on a Mac, ⌘Z).', 'Action button - Save');

  var ss = SpreadsheetApp.getActive();
  // [START modifiable parameters]
  var rangeToClear = ss.getRange('Active Jobs!A2:F2');
  // [END modifiable parameters]
  rangeToClear.clearContent();
  ss.toast("Cleared range '" + rangeToClear.getSheet().getName() + "'!" + rangeToClear.getA1Notation() + '. ' +
    'To undo, press Control+Z (on a Mac, ⌘Z).', 'Action button - Clear');
  rangeToClear.activate();
}

I have two problems:

1, var targetRange = ss.getRange('Active Jobs!A3:F3');

this line needs to read... in plain english..... find the last available row and insert



2, The delete does not seem to clear the last visited cell. So the last cell that the user inputs into is F2. If the user does not click out of that cell before pressing save then this cell is ignored.

thanks for your help.

https://docs.google.com/spreadsheets/d/1qSauIqjvSEhEEZJ6z4pJUnR_HZcoMi98frAx94zl6a8/edit?usp=sharing