I recommend reading. Set aside an hour every day and read long texts. Reading trains you to retain focus on a single thing for a period of time, which is required to understand a complicated subject or to make a sophisticated argument.
Speicifically what you read should take longer than an hour to complete, else you end up in a literary analogue of compulsively consuming sugary snacks in lieu of proper meals.
Speicifically what you read should take longer than an hour to complete, else you end up in a literary analogue of compulsively consuming sugary snacks in lieu of proper meals.