Loosing 2-3 seconds over how long , an hour, week , year ?
The clock has a trim register to adjust accuracy or for external temperature compensation. As it stands I can’t see any built in temperature compensation and performance will depend on the quality of the Crystal you use.
Never used one and can’t find much detail on it .
The DS3231 is a very accurate , temperature compensated clock , in my experience , why not buy another?
If you want absolute accuracy look at getting time from an internet source