Generating a sheet and naming it incrementally on Google Apps Script - google-apps-script

Question

The program below basically summons a modal popup that asks for a sheet #. When a value is added, it changes the name of the current sheet name "RCdisb (OpEx) : Current" to "RCdisb (OpEx) : Sheet #1" when the script runs. After this, It then creates another sheet and names it to "RCdisb (OpEx) : Current" following a template.
Now my problem is I am limited to Sheet #1 as for some reason my rcdisbopex = 1 does not increment the value when running the script.
The goal that I want to have is when I create a sheet and it changes the current sheets name, I would like the changed name to follow a number order from 1 - 10 (Ex. Sheet #1, Sheet #2, etc.)
function newOpex(){
const ws = SpreadsheetApp.getActiveSpreadsheet()
var ui = SpreadsheetApp.getUi();
var rcdisbopex = 1;
var result = ui.prompt(
'📄 Create New Operating Expense Sheet',
'Please enter Sheet Number:',
ui.ButtonSet.OK_CANCEL);
// Process the user's response.
var button = result.getSelectedButton();
var text = result.getResponseText()
if (button == ui.Button.OK) {
// User clicked "OK".
var newOpexName = SpreadsheetApp.getActive().getSheetByName("RCDisb (OpEx) : Current").setName("RCDisb (OpEx) : Sheet #"+ rcdisbopex);
var newOpexSheet = newOpexName.getSheetName();
Logger.log(newOpexSheet);
rcdisbopex++;
var templateSheet = ws.getSheetByName('templateOpEx');
ws.insertSheet('RCDisb (OpEx) : Current', 2, {template: templateSheet});
var sheetName = ('RCDisb (OpEx) : Current');
Logger.log(sheetName);
Utilities.sleep(1000)
} else if (button == ui.Button.CANCEL) {
// User clicked "Cancel".
ui.alert('⚠️Operation Cancelled.');
} else if (button == ui.Button.CLOSE) {
// User clicked X in the title bar.
ui.alert('⚠️You closed the dialog.');
}
var ss = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName);
ss.getRange(9, 8, 1, 1).setValue(text)
ss.getRange(8, 8, 1, 1).setValue(text)
ss.getRange(5, 6, 1, 1).setValue("Period Covered: "+ date)
}