Not really a method but rather a few explanations that may help you if you can use them.
1. In linguistics, there is something called "interference". Basically, when you learn multiple words at the same time, they can interfere with each others and they become more difficult to learn. In the worst, you brain may even decide to remove all of them because it can't solve the inteference. The mean reason why they interfere with each other is often because they are similar in some kind of way. Synonym, homophone are basic examples of words that interfere with each other. And there are a lot of them in japanese. And it doesn't stop there. Words like 聞く (kiku), 書く (kaku) with only one different kana are also more difficult to learn at the same time. You won't perceive that right now but when you will try to speak later, it will show up (trying to say 聞く and ending up saying 書く). Words that have similar translation are also more difficult to learn at the same time, etc, etc. But to solve that, there is a simple trick: Just don't learn them at the same time. Block the one that are tricky, focus on the easy ones until they are stabilized and after that take your time with the tricky (writing them, studying the nuances for synonyms, etc).
2. Words are not equal in difficulty. And there's nothing you can do about that. Some words have complicated kanji, some use multiple kanji, others are abstract, etc. and they are just "harder" to learn. But same things here, you can simply block them and wait for the right timing. Learning a word after you already studied for the kanji in it is incredibly easier. Learning a word while studying in context, doing extra things beyond just clearing your schedule can help a lot. Like, if you like cooking, then create a schedule with cooking related words, read and try a recipe in japanese every week, watch some cooking video or short a bit every day, write the recipes you like, etc., they will be easier to learn. But, it's also a lot more work. So, if you don't the time, just don't worry about them and block them. Renshuu will remember everything single one of them for you. And same as before, you can clear the easy one first to give yourself more time and energy to focus on them. In my case, I block words for years for various reasons. And I only rediscovered them recently while studying some kanji. There are much easier to remember now.
To sum up, "timing" can help a lot:
- Avoid learning similar words at the same time because they interfere with each others. Especially if you're learning too much words at the same time, the "interference" will grow proportionaly to the number of words. Blocking them, taking a break, etc are all good method to let your brain stabilize at least the easy one. And after that, it will give more time and energy to focus on the tricky one.
- You don't need to learn every single words that you are told to learn "right now". You can wait for better timing, circumstances. Basic one is when you cleared all the easy one from your schedules. But you could also just ignore them for now and focus on kanji for while. Each kanji, especially the basic ones can "unlock" up to a hundred words. It may not be the ones you want to learn right now but it help a lot in the long term. Kanji are difficult but they are also like "buy one, get a hundred words half price".
Also, imo, just blocking words and focusing on the easy one is the "best" for beginners. Because it's simple and doesn't require a more complicated setup or additional energy. Sure, they are more "advanced" method but if it cost too much just to set up (in term of energy, motivation or even result) then it's worth it. The cooking example is a very good effective method. But I never seens anyone able to use them perfectly. Because it cost too much and it's not worth the effort when you're a beginner. Later tho, it's probably one of the most effective method. It's just like studying math, geography, etc at school. You focus on a topic and try to clear every problem. Also it make you learn things that are not related to language directly but are necessary. A basic example is politeness. You can spend as much as you want, there are words that you will struggle with until you learn more about Japan as a society.
Anyway, I talk too much, good luck and have fun! :D
頑張ってね～
