Could someone check my sentences on grammar?

Could someone check my sentences on grammar?

Tom kindly declined Moses's invitation, since he wasn't in the mood for a party because his stocks became worthless, which was his life savings.

The acid rain eroded the forest in my backyard. The deterioation couldn't be stopped, since it had severly damaged the roots of the forest, which in turn has caused irreversible damage to the forest.

We ought to minimize our loses before we become bankrupt.

Researchers often narrow their focus on a topic so that they can consicely formulate their research question.

The loud fighting of the neighbours dragged on for years, but the fighting is thankfully reduced to a state that doesn't bother me anymore.

With some disease, for example Mokll, your health will rapidly deterioate if it's treated because the treatment of the dissease will actually worsen your health.

Thank you for your time.