JUNHO (#1) sold 40,907.
miwa (#2) 'only' sold 28,949.
Utada (#3) sold 27,997.
(
https://www.oricon.co.jp/rank/ja/w/2018-07-23/)
I'm not sure if miwa has anything left in her tank, bag of tricks, whatever...I don't know where she fits right now.
The reason why her popularity shot up was because of the guitarissimo album that was #1...but not without the earthquake and tsunami back in 2011 that really shuffled a lot of album releases (including AKB48's, which had to delay further to June instead of April). If it wasn't for that, miwa wouldn't be #1 - and the entire world wouldn't be in a position like this...
Also, not to forget, miwa was left out of the Kouhaku last year (2017).