I’m working on phrasing.app partially to solve this problem. My solutions are:

- study flashcards from l3 <-> l4 to cut down on time - practice switching between the languages and distinguishing between them (I use interleaved flashcards on phrasing) - have a really painless audio review (to get a lot of your reviews done quickly) - listen to input every now and then (tv, podcast, something). A little bit every now and then goes a long way