I’m so impressed by your passion about learning Japanese. Learning and memorizing characters are really tough .Especially “Kanagi” is hard even for Japanese. I think your learning way is good . Because, many of Japanese children learn kanji like you. They practice over and over. And they take kanji tests every week at school . And if they find mistakes by tests, they practice Kanji that they mistook or forgot again. I think you should practice and memorize kanji with example compound words and sentences. For example, when you leaned “空”, you should make sentences and compound words with 空. “空はあおい” “そのはこは空だ“ “空気”. “空手” etc. Japanese children usually memorize with sentences and compound words. And When it comes to “ hiragana” “katakana “, I think you should memorize sounds at first, personally. After you can memorize all sounds, practice writing with example words. Like, あひる、あさ、あめ .etc But, as you know, Everybody has their learning way . I hope you can find your best way. Keep it up! がんばってください。

I just started learning Japanese as well, however, I have been learning Chinese for 15 years, so I believe I can say something about memorizing kanji/characters (they are the same, just pronounced differently). You could spend hours writing it over and over. However, you will likely waste a lot of time that way. A better way would be to use mnemonics to help you remember. For example: の looks like a circle, NO almost a circle! Or: え　looks like someone who is running away. I hAte people who run away from me. Using this way, I can remember 80% of hiragana after just 3 days (spending about an hour a day). Of course, writing takes a bit longer, but this does speed up the process. Same for kanji. Take 5 minutes to create a mnemonic/visual story for each one, and it'll save you loads of time reviewing. Hope it helps! Josh