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A "should" is a "could" with shame on top.

I 'should' eat better. - In other words, if i don't then i will feel BAD about me, and when we feel bad about ourselves - that is shame.  Unnecessary.

I 'should' earn a lot of money - If i don't then i'm not successful - subtle shame.

I 'should' enjoy time with my kids - If i don't i'm not a good mom.

I 'should' not be tired - If i am then i am doing my day wrong, why can't i figure it out.

VS.

I could eat better.  If i don't it's okay.  I still feel good about me.  I still love me and i'm not going to hold it against myself.

I could earn more money, but if i don't i'm not going to beat myself up for it.

I could enjoy ALL my time with my kids but when i don't i won't make it mean i'm a bad mom.

I could feel energized all day but if i'm tired i will love on me and not judge myself for it. 

A 'could' creates a loving environment in your head to make a loving choice for yourself. 
Choose a could.