Beyoncé for sure. she went from the best selling female group to solo TITAN and best performer alive.
she is the complete package talent wise and commercially
(touring career, #1 albums, classic singles, radio smashes, streaming power)
and 17 years and still counting. not one flop era.
and she still has to sellout after these 2 quality focused albums.
so she basically has 2 successful eras at very very very least from now.