The intensity of noises and the duration of your exposure to them are the causes of noise-induced hearing loss.
Consider wearing hearing protection, such as earplugs or earmuffs.
If it’s too loud in a restaurant or theatre, ask the manager to turn it down.
If you have wax buildup in your ears, use an at-home irrigation kit to soften it and gently wash it out.
You can also wear earplugs and earmuffs together for greater protection.