There is no end to the work, so I hope there is another way I can stick and enjoy learning instead of using a vocabulary notebook.
If you know another way, please tell me how you increase your vocabulary.
I read a lot using a Kindle in which I can easily look up the words I do not know. I highlight the words I looked up and review them a few days later and a few weeks later. (You can do this same thing without a Kindle if you use the free Readlang extension for Chrome and read things on the Internet.) I only read things I enjoy reading. I tend to read things around a theme to help get more repetition of particular types of words-- for example reading a few crime-related novels to gain vocabulary about law and forensics.
I also use movies. I watch them on my computer, starting with subtitles in my target language so I can pause the movie and look up the new vocabulary in it. Later I watch it again without subtitles to reinforce the vocabulary. (Because I have easy access to native speaker teachers, with the movies I enjoy the most, I also go back through them another time with a teacher. I share my screen, turn off the audio, and using the subtitles in my own language I try to tell them what is happening and what the characters are saying-- trying to think in my target language instead of translating literally the subtitles.)