I try to learn English more by watching English movies rather than anything else. I was watching the movie Shazam (2019). At 01:27:05 when the boy meets his biological mother. The mother says "I realized that they could do a better job taking care of you than I ever will".
But when you say something which is meant for the past you use could and would. Don't you think it should have been "would" instead of will at the end of the line?