80% is too high a bounce rate.
It is worth considering what method of measuring bounce rate you use. Newer platforms like Nudge improves the accuracy of the measure of the bounce rate by excluding people that actually engage with the page and read it from the bounce rate calculation. In older measurement systems this would not be included.
It could be that users are clicking through and reading your content, then hitting the back button. It may make sense to try different measurement to get a better picture of what users are doing.
This is part of our Guide to Bounce rate.