I am learning Italian, French and Russian at the same time. The main reason is that I have been learning French for quite some time and I just continue. I started Italian because of business reasons a few years ago.
As for Russian, I stopped for a long time and decided to resume it.
Sometimes, I wonder whether I should focus on just one of them, but then I don't know which ones to give up.

Question

I am learning Italian, French and Russian at the same time. The main reason is that I have been learning French for quite some time and I just continue. I started Italian because of business reasons a few years ago.
As for Russian, I stopped for a long time and decided to resume it. 
Sometimes, I wonder whether I should focus on just one of them, but then I don't know which ones to give up.

Answer

I think that the language you know well you can learn learn more passively (for example, just listen to podcasts from time to time, songs, short videos). And the languages ​​or languages ​​that you need to work on should be actively studied

Answer

That’s totally up to you. Plenty of people study multiple languages at one time, while others prefer to focus on just one. I like to do multiple languages at once, and I might keep doing all languages in which you have more than a basic level. You wouldn’t want to lose the language skills you’ve already developed…