Difficulty Switching between Japanese and English

I lived in the Philippines for two years and two months. I spoke English and the local Filipino dialect during this period.  However, I have been back in Japan for nine months and I now have difficulty speaking English. I can't speak instantly even talking with my American friend.  How do you keep your second language skills strong when you don't use the language in daily life?

I lived in the Philippines for two years ...  - simple past - describes a completed action in the past

I have lived in the Philippines for two years ... - present perfect - describes a completed action at an unspecified time during a period that continues until the present or an ongoing action that continues until the present.  In this case, "I have lived in the Philippines ..." means I live in the Philippines now and I started living in the Philippines two years and two months ago.

すみません。I don't have the time to correct your entry, but I do have answers to your questions! がんばてください。I made a comment but the formatting doesn't work well :(  so I am posting here instead.

I highly recommend the videos listed below. Jun learned to speak English very fluently even without leaving Japan. It's quite simple: if you want to get better at speaking, then practise speaking. Even if it is simple, make sure you can say the simple sentence perfectly. Try saying "I've lived in the Phillipines for two years and two months." over and over again until you don't need to think about it. Let your muscle memory in your tongue (and vocal cords) talk for you. Also, have fun!!

--みって ください--
英語はどうすれば良くなりますか？ How I learned English 1
https://www.youtube.com/watch?v=gZpDVK63bbg

Q.どうやって英語を勉強したの？ A.勉強はしない。How I learned English 2
https://www.youtube.com/watch?v=dW4cWX505fA

3ヶ月で帰国子女を言い負かす How I learned English 3 (スピーキング編)
https://www.youtube.com/watch?v=--ZFe7-NJwE&t=19s

BONUS Video made by KemushiChan ロレッタ:
Am I Fluent? ｜ 私、英語ペラペラ？　【英会話06】
https://www.youtube.com/watch?v=MupsybgqGxs