Language Modes vs. Monolingual Focus: What Works Best for You?

I’ve always been curious about how other polyglots handle switching between languages during different tasks. Do you find it helpful to fully immerse yourself in one language at a time, or do you jump between them depending on the context? For example, I tend to use Spanish for analytical work (thanks to my econ background) but switch to English for music tech it just feels more intuitive.

Does anyone else experience this, or do you stick to one language to maintain focus? I’d love to hear how you balance efficiency and fluency when juggling multiple languages. Any tips for minimizing mental fatigue when switching?