Obviously now that you are on macOS Sequoia you have no issues other than updates to Sequoia to worry about for a year. There are some suggestions in the TitBITS article on Preventing Sonoma from Upgrading that may be helpful to you in, "There may be a few ways to forestall the upgrade:" in that article but short of a "Clean" Instal to remove all traces of Sonoma I cannot think of an easy solution.
A clean instal would require you to completely erase your MBP, reinstall macOS Sequoia and restore all of your files from backup. This is doable, I've done it many times, but it is time consuming and requires some expertise.