7. Learn the word again on other days
Don’t just learn or practice a word one day and then forget about it. You may think you have learned the word (since you have just been using it) but if you try to remember/use the new word a couple of weeks later, you may find it difficult. To really remember a word you need to reuse that word over and over before it sticks in your long-term memory.
There is a saying in English “Use it or lose it.” Basically this means if you don’t use (or practice) something you have learned, you will eventually forget how to use it properly.