Add fzf to get fuzzy search for your history. I reuse long complicated commands all the time by pressing Ctrl+R and then typing the first letters of a few words I remember using.
Changing HISTFILE by context has been a huge win, keeping commands from generic system administration or different projects from getting in the way as I search back through my history to do a thing again.
https://github.com/junegunn/fzf
It's also useful to remove duplicate commands and store infinite history. Add this to ~/.bashrc: