As Monzo are making so many changes to the app, can I suggest you add a change/highlights log - covering the major changes - within the app.
This would allow users who use Monzo but who do not obsessively use the forum to easily discover changes/improvements made to the app.
You already do this to some extent with the ‘Whats new’ descriptions in the app stores, but so many people have their phones to update apps automatically, so will miss these notifications/information.