Alexei Navalny’s death, leaving behind his wife and two children, showed the harsh reality that martyrdom isn't always worth it. Sacrifice is not always rewarded. Sometimes the tyrants win. Unless you believe in karma or divine retribution.
I think Navalny was counting on the Russian people to respond strongly. Unfortunately after his death, everything carried on as normal. Western governments continue to be a soft touch and buy oil from Russia. I'm not sure he would still give his life after seeing how the world failed him.