Instead of doing, say 4 hours of A then 4 hours of B, do 30 mins of A, take a small break, do 30 mins of B, take a small break, etc. As you get tired overall, take a longer break and then get back to it when you are refreshed.
Spacing your sessions out throughout the day/week can also make your learning more efficient.
Most of the lessons I study in LingQ are videos from YouTube. The topics of the videos are interesting and compelling, which helps me keep learning a language without losing enthusiasm. The primary purpose of this activity (reading and listening) is language learning, the contents are the additional effects for me. So, it would be beneficial for you to spend content about marketing in LingQ.
However, the time spent on LingQ is for language learning, and focused study time is necessary to be skillful in some skill or job. So, I allocate exclusive study time for the subjects I am really interested in.
I recommend you allocate time slots for each task (marketing and language) and exploit the language learning time to get additional benefits.
Depending on how advanced your reading ability is in Spanish, you could always read some marketing materials in that language. I do this with French for subjects that interest me. A less ideal situation would be to use AI to convert more complex material into text that is easier for you to grasp in Spanish, but that might end up watering it down to the point that it’s no longer useful to you.
I completely understand having learning problems, I’ve had them myself for over 60 years, with both focusing on and remembering study materials. Sometimes I need to break a task up into smaller parts instead of trying to power my way through it all at once. I work on one subject for a bit, and then switch over to another one. As they say, a change is as good as a rest sometimes. That’s how I maintain 2-3 hours of language study per day, 7 days a week.
I’m retired now, so I spend my productive time learning languages. I read in French for 90 minutes a day on LingQ, and then spend a smaller amount of time here reading simple Spanish stories and articles. Then I continue working on Spanish on two other websites, doing a number of different types of exercises focusing on grammar, vocabulary, and basic sentence patterns. I’ve used those for a number of different languages in the past.
I’m subscribed to yet another site that focuses entirely on grammar, but I can only handle that in short sessions at a time, I much prefer reading in my target languages, but grammar still needs to be dealt with at certain points.
I hope that you are able to find a process that works for you!
I always wanted to be that guy who just pastes a link to a research paper into a forum discussion without elaborating any further. Finally, my time has come!