These principles can be adapted for older children. Older children could be involved in your study time. Explaining what you learned in appropriate language can help you remember it and help your child feel involved. You can show them that you value learning. Don't let yourself get isolated.
Motivation seems to be harder to achieve on line.
Motivation comes from interacting with others. If you are having difficulty reading on screen, Maximize the size of your browser, Alter the fonts your browser is using, or Print out a copy. Almost everyone prints out longer pieces for leisurely reading. Read in shorter time segments, looking away from the screen periodically. Pause to reflect on what you are reading.