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A year and a half ago (https://caslsintercom.uoregon.edu/content/24104), CASLS Research Director Linda Forrest summarized three strategies for deep learning and memory: spaced or distributed learning, retrieval practice, and elaborative semantic processing.

She describes spaced learning (or spaced repetition) as follows: "Study sessions are distributed across time instead of being crammed into a single session. Students can do this on their own by using brief, but frequent, study sessions. Teachers can encourage this type of study by recycling vocabulary and giving frequent cumulative low-stakes quizzes or practice exercises that focus on the most recent materials but include items from all materials studied so far. Research has shown that re-studying material after about one week produces superior long-term retention as compared to cramming."

Spaced repetition is an area where technology has stepped in in really helpful ways. For example, online flashcard apps use spaced repetition, quizzing people more frequently on the items they struggle with and bringing old words back into play from time to time. Here are some resources for spaced repetition:

Here's an article from Quartz summarizing the value of spaced repetition and overviewing several online apps, including Anki, Tinycards, Memrise, iKnow, and Pleco: https://qz.com/1211561/how-to-learn-a-language-use-spaced-repetition/. Here's another article about spaced repetition from Fluent in 3 Months: https://www.fluentin3months.com/spaced-repetition/. 

The Leitner system is a spaced repetition system that uses paper flashcards and different boxes or stacks: https://en.wikipedia.org/wiki/Leitner_system

Anki is free, popular (so there are a lot of existing decks of cards that you can use), and simple to use. It's available at https://apps.ankiweb.net/, and you can read a recent review at https://www.fluentin3months.com/anki-cards/

Tinycards is a Duolingo product that uses spaced repetition: https://tinycards.duolingo.com/

Memrise, like Anki, is very popular (so there are lots of existing decks that you may find useful), and it's easy to use: https://www.memrise.com/