I was able to maintain relative fluency only in three languages at a time. Switching between more languages is not practical for me. But at various times, I was fluent in five languages in total.
I love you. Я тебя люблю. Ich liebe dich. Я тебе кохаю. Te quiero.
Before five, I spoke mainly Ukrainian, but also Russian. By twelve, I spoke Spanish (reviving it at 27 failed). I started with German in 1999, becoming fully fluent by twenty-eight, and my real English fluency started with 2010s, though I had it in schools.
In the past, I tried to study French, Chinese, and Japanese - to read poetry and to improve my calligraphic stroke, but I did not have enough time to achieve much.