MITIGATE

to make or become less severe or intense

to moderate

lessen or try to lessen the seriousness or extent of
SYN - extenuate, palliate

"He knew he wasn't going to completely rid them of the problem, but he was atleast hoping to mitigate it."

"The situation calmed down when the adriot teacher stepped in to mitigate."

"She was the perfect mentor for him as she was able to harness his wild energy will mitigating his anger and aggression."