Im interested in learning german but im afraid it would impact my english

So lately i developed an interest in learning the german language, but the problem is im afraid it would ruin my english fluency, cuz i already had this happen with french, i used to be fluent in french, then i completely shifted my focus to english, and lost like 80% of my french. Now if you speak to me in french id understand you, but id struggle to speak. I dont want to lose my english fluency, so how do i balance both german and english? Right now i have almost everything in english: my device language, the people i talk to online, i even think in english more than my native language. Give me some tips plz, and thanks.