How do I opt out of paying estimated taxes. I no longer need to do so. I now work for a group that withholds taxes and I was charged a penalty in 2022.

There is no "opt out".  The decision to pay or to not pay estimated taxes is yours and yours alone.

There were other replies to your previous post for the estimated taxes subject here - https://ttlc.intuit.com/community/taxes/discussion/estimated-taxes/00/3072995

Just don't pay the estimates.  They are optional to pay and the IRS won't be expecting them.   Hopefully your withholding will be enough to cover the tax on all your income including any income that doesn't have withholding like interest and dividends, etc.