1. Select a Language: The first step is choosing a language you wish to learn. You could select a language based on your interest, necessity, or a country you plan to visit in 2023.

2. Establish Goals: Now that you've selected a language, you need to set up achievable goals. Since you aim to learn this by Christmas 2023, divide your time and make weekly or monthly targets for vocabulary, grammar, pronunciation, and conversations.

3. Use Language Learning Apps or Platforms: Numerous resources allow you to learn a language online at your own pace, like Duolingo, Babbel, Memrise, or Rosetta Stone. Some have speech recognition features to improve pronunciation.

4. Immersion: Try immersing yourself in the language as much as possible. Watch films or series, listen to music, and try reading books or news articles in the target language. This could be the best method for understanding context, slang, and everyday language.

5. Find a Language Partner: Find a native speaker to interact with, or get a language partner who is also learning. This can be a great way to improve conversational skills. Apps like HelloTalk or Tandem can help.

6. Take Online Lessons or Hire a Tutor: You could hire an online tutor who provides one-to-one classes to enhance your skills faster. Websites like Preply or italki have numerous tutors for different languages.

7. Attend Language Meetups or Clubs: Try to find local language meetups or clubs, where you can interact and learn in a fun environment.

8. Practice Daily: Consistency is key in language learning. Spend some time every day, whether it's 15 minutes or an hour, to practice the language. Even daily reviewing vocab or grammar can be beneficial.

9. Memorize Common Phrases: Knowing common phrases and idioms can help you sound more natural. Try to learn and use them in conversations.

10. Be Patient: Language learning takes time. Do not get discouraged if you make mistakes. Keep practicing and do not rush. Progress will be steady if you are consistent and patient.

By following these steps, you should be able to gain a significant understanding and usage of your chosen language by Christmas 2023. Good luck!