Timing out issue in Google Sheet - google-apps-script

Question

The code below is used to perform some simple functions in a Google Sheet.
It creates two new sheets (makes them (0) and (1), names them, and adds color) and hides another sheet.
The code has been extremely unreliable. If I create a blank google sheet and test it works fine but when I add it to the live version of the sheet it times out and fails to run all the code.
I also tested copying the live version (in case there was some corruption in the file) and initially it seemed to work but then the same problem occurred. I am brand new to app script so perhaps I am missing something obvious. I would appreciate any suggestions.
function New_Tabs() {
var spreadsheet = SpreadsheetApp.getActive();
var curDate = Utilities.formatDate(new Date(), "GMT+1", "M/d") //sets format for current
date as month/day
//Selects and activates the Day_date sheet / Gets calculated date info
var sheet = SpreadsheetApp.getActive().getSheetByName('Day_Date');
sheet.activate();
var val = SpreadsheetApp.getActiveSheet().getRange(2,6).getValue();
//Logger.log(val) Used this to check the value was pulled correctly
//Insert the sheet for today's date - Data from portal/Excel macro will be pasted here
spreadsheet.insertSheet(0); //Makes it the first sheet
spreadsheet.getActiveSheet().setName(val); //pulls calculated date from Day_Date sheet
spreadsheet.getActiveSheet().setTabColor('#00ff00'); //Colors the sheet tab green
//Insert the sheet for Logistics
spreadsheet.insertSheet(1); //Makes it the second sheet
spreadsheet.getActiveSheet().setName("Logistics " + curDate ); //names the sheet with text
and current date
spreadsheet.getActiveSheet().setTabColor('#00ff00'); //Colors the sheet tab green
//trying to slow down to make hiding the tab more reliable
Utilities.sleep(2000);// pause for 2 seconds
//selects the sheet for today's date - Data from portal/Excel macro will be pasted here
spreadsheet.setActiveSheet(spreadsheet.getSheetByName(val), true);
//trying to slow down to make hiding the tab more reliable
Utilities.sleep(2000);// pause for 200 milliseconds
//selects the Day_date sheet and hides it
spreadsheet.setActiveSheet(spreadsheet.getSheetByName('Day_Date'), true);
spreadsheet.getActiveSheet().hideSheet();
SpreadsheetApp.getUi().alert("Completed");
};

Answer 1

Try it this way:
function New_Tabs() {
const ss = SpreadsheetApp.getActive();
const curDate = Utilities.formatDate(new Date(), "GMT+1", "M/d");
const sh = SpreadsheetApp.getActive().getSheetByName('Day_Date');
const val = sh.getRange(2,6).getValue();
let ns = ss.insertSheet(0);
ns.setName(val);
ns.setTabColor('#00ff00');
let ns1 = ss.insertSheet(1);
ns1.setName("Logistics " + curDate );
ns1.setTabColor('#00ff00');
ns.hideSheet();
ss.toast("Completed")
}