If the sump plug isn’t too badly rounded try using a good quality socket that grips the flats rather than the corners of the nut.
On a couple of occasions I have used an electric impact wrench to remove the sump plug on cars where someone else last tightened it. This has always worked and is less likely to round or break the nut than continuous high torque with a breaker bar.
When fitting a new sump plug use a new crush washer and be wary of tightening it to the torque suggested in the manual. Book torque settings usually assume dry threads which you won’t have on a sump plug. Something closer to 2/3 generally works for me and I’ve never had one come loose in over thirty years of DIY oil changes.
I wonder if whoever torqued your sump plug used the same approach on the filter. If so, have a look at Yato metal strap wrenches.
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