The other day I come across the interesting idea of language cross-training (I don’t remember where though, unfortunately). The writer suggested that when learning a language, it can sometimes be beneficial to have a break to learn a bit of another language. The aim isn’t necessarily to become fluent in the second language, but the process of studying that language can help to keep your brain flexible as you grapple with different sounds, grammatical structures and word order. For example, while learning Spanish you could take a break and learn some Turkish. When you go back to the Spanish it will probably seem easier.
Have you tried this technique? Does it work?