I am looking for a positive synonym for the word sacrifice. Something that highlights the positive qualities needed to sacrifice the old and go with the new.
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"Trade up" and "modernize", within certain contexts address the concept of replacing old with new but they do not express any pain associated with that exchange. The best word I can think of is your subject word, "sacrifice", used in conjunction with another word or two to make a very clear expression such as:
Based on your explanation, which is subtly different than the title, such a change might be described as
for that sense of "out with the old, in with the new".