If you’re trying to decide whether juggling two languages at a time is for you, check out his tips.
Benny from Fluent in 3 Months suggests that it’s not a good idea to choose more than two languages at a time and that the languages should be quite distinct (for example, an easy language and a difficult language). He also says it’s best to study both languages every day.
Chris from Actual Fluency also reckons that learning one language at a time is the most efficient way of approaching multilingualism. His blog also contains a number of tips from language learners on how to learn more than one language at a time.