Mindset
Feeling, Somewhat
adverb, noun
When it comes to your heart, the way you hold (持つ) it determines your mindset and your feelings.
心持ち is a slightly old-fashioned word for someone's inner state or attitude beneath the surface — kind of like their frame of mind or disposition. In modern usage, it's more commonly used as an adverb to mean "somewhat," like 心持ち速く (somewhat fast, just a bit faster).
The readings for this word are both kun'yomi readings. You learned them when you learned the words 心 and 持つ, so you should be able to read this on your own.
何事もポジティブな心持ちが大切だよね。
Having a positive mindset is important for everything, right?
このカレー、一人分にしては心持ち多くない？
Isn't this curry just a bit too much for one person?
あの子は、心持ちのよい素直な子です。
He is a pleasant, honest kid.