Those are some pretty decent immersion options. However, I'll put in my two-cents here and hope it'll be of use to someone.
Essentially, immersion only works if your current dominant environment is changed over to Japanese. Instead of reading a website in your native language, read it in Japanese; instead of native language menu interface in your Windows/Linux/Mac environment, use Japanese menu interface; instead of native computer keyboard, use Japanese kana-input keyboard, learn to type using kana-input on a kana-input typing-tutor; begin using Anki flash cards to input kana from the kana-input keyboard and converting it to kanji, etc. Note that all of these things are found in computer-based environments. So, if your environment is mostly computer-based, that is the immersion environment for you to change-over to Japanese. It doesn't have to be done all at once, but gradually include something Japanese into your dominant environment instead of the comfortable native language.
For the most part, it depends entirely upon YOUR dominant environment. So if your dominant environment is on your cellular smart phone, try changing the native language to Japanese and begin learning the Japanese language so you can operate your smart phone that you are comfortable with, and already know how to use prevalently. Eventually, you can begin stepping outside of your dominant environment and begin including other environments such as the public library, grocery stores, town centers, etc. Begin reading Japanese books, I would suggest starting with the children's fictional stories section not because you are immature, but rather "dipping your toes in the cold waters" of reading the Japanese language in books in a new environment. The whole point is to not overwhelm yourself, yet, to not make yourself too comfortable. If you find yourself becoming comfortable in your Japanese immersed dominant environment, that's a good opportunity to step into another environment and begin "testing the waters" with what you've already picked up. If you feel too overwhelmed, and you find yourself having a hard time being able to learn Japanese in a new environment, revert back to your native language for the most part, using only what you are comfortable with until you become comfortable taking on new immersions, and then return to learning Japanese in the new environment. The environments could be literally anything, and only the limitations of your imagination prevent you from immersing yourself in the Japanese language within your environments.
To make it simple:
native language = dominant
japanese language = non-dominant
dominant environment = well-known and comfortable
new environment = not well-known and uncomfortable
Native language in new environments until they become comfortable environments.
Then slowly begin introducing new Japanese immersions.
Japanese language immersion in dominant environments until you become comfortable with the Japanese language in that environment.
Then one-by-one, comfortably introduce new Japanese immersions.
All this is, is leveraging what you know and are comfortable with performing in order to learn something you've never done before.
Above all else, put it to work FOR you, if something isn't working for you, re-think it, divide it up if possible into smaller immersions or move to less-uncomfortable environments.
