Yes!

Technically I only speak 2 languages fluently(Swedish and English), but having taken French in junior high and then I learn basic Russian as a fun activity at my church, then I learned a few words in Finnish but that's super different. Then I took Danish language comprehension as my one university course (it's similar to Swedish, but like they have a potato in their mouth and talk in their throat and skip the last half of most words)

Now I'm learning Korean.

So, some people would say it's easier to pick up a language in the same language group, which is true, because there are less completely new words and word order to get familiar with.

Why I say Yes, is because having learned a little bit of a lot of different languages has set me up to be open to new words way more easily than someone who's never learned a different language.

I recognize words that are the same on lots of languages, or sound the same but mean something else. Those words are easier to remember because I'm already somewhat familiar with them.

Having learned some Russian that has a relatively simple word order, (they skip a lot of between words) has helped me with Korean because they tend to skip certain between words, or add to the end of words instead of adding a new word. This is how Finish works.

Having learned French that flips the order of sentences compared to English had also set me up to understand Korean language structure quicker than someone who's never engaged in one of those languages before.

Also, Russian has a few words that are different if you know someone, or if they're older than you, which is extremely important in Korean.

Having watched a lot of Korean shows, they get super upset if someone "talks down" or "talks casually" dropping g honorifics to people even just one year older, or a boss.

I would say currently I have 3 buckets, 1 Swedish, 1 English, and 1 with all the others where if I'm speaking one, I'll borrow from another one if I'm missing a word, but I am fully aware of using the wrong language. 🤣

I hope this gives you some insight to how I see the answer to your question. 🙂