I grew up with a thick Australian accent with a drawl I dislike, and have been consciously trying to change it for a while. The problem is I tried to make it sound more American at first but keep getting drawn to speaking "Britishly". Now it's a Frankenstein of all 3 accents and I don't know what to go with.
Some points for both:
▪︎ American accent sounds "cooler"
▪︎ British accent sounds more "proper and elegant"
Australian accent sounds more "relaxed" (but I dislike this for myself, personally).
I take what you mean with "American accent" being the accent they use on US Television in shows and most news?
Because there's a hell of a lot of regional accents in both Britain and the US and various ones in both sounds stupid while others sound sophisticated.