A house fire is my biggest fear/threat.
Trying to figure out how best to minimize the risk without creating others.
Discussion
Upgrade your main panel
In a weird coincidence, a group a five guys just should up and replaced all the sprinkler heads in our condo.
One of the main things that reduced fires in homes dramatically since the 1970s was GFCI outlets. You should have them in your kitchen, bathroom, laundry room and outside. The recent code was upgraded for anything below grade as well. Those are pretty important. Everything else would be more common sense for home fires (clean the furnace or keep it clean, don’t use candles etc…)