Hasibrahman By the way vs After all Both of these are better placed at the beginning of a sentence and are less effective at the end, but they don't have the same meaning, so neither can replace the other. In very general terms, 'after all' introduces an idea that is related to the previous idea, while 'by the way' introduces an idea that contrasts with the previous idea. The most natural sentences among your examples are these: I don't know why you're so concerned; after all, it isn't your problem.
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Hasibrahman By the way vs After all
Both of these are better placed at the beginning of a sentence and are less effective at the end, but they don't have the same meaning, so neither can replace the other.
In very general terms, 'after all' introduces an idea that is related to the previous idea, while 'by the way' introduces an idea that contrasts wi
by the way is used when you are casually adding some unimportant information. as an afterthought.
eg I had a boring day yesterday. By the way, I won $10 in the lottery.
But not eg I had a boring day yesterday. By the way, I won $10,000,000 in the lottery.
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