I’m not a fan of the new sound effects either. Thankfully there are game mods available for the original sound effects and music!
A game mod for the original sound effects is now available from @StepS7578 here: https://www.ageofempires.com/mods/details/2397/
StepS also put together a game mod for the original soundtrack here: https://www.ageofempires.com/mods/details/2548/