undertake problem solving, to lift one’s mood

Question

 

An adaptive and instrumental alternative that we have investigated is to use pleasant or neutral distractions to lift one’s mood and relieve one’s depressive symptoms; and only then, if necessary, to undertake problem solving.

Answer 1

to lift one's mood : خلق کسی را بهتر کردن/ بهبود بخشیدن 
to undertake problem solving : به حل مساله مبادرت ورزیدن،