The only suggestion I have is the obvious.

Only research a topic you are interested in. When it comes to history don’t feel the need to limit yourself to “traditional” history topics.

History of Film

History of Video Game developement

History of US skyscrapers are all totally valid historical pursuits.

That is one of the big reasons I give props to Erik Larson. He does a great. Job of telling unusual history and wrapping it around more engaging stories.