Which word could replace stingy to make the sentence feel more positive?

It depends on the context of the sentence. "Stingy" has a negative connotation, so a positive replacement would depend on what you're trying to say. Here are some options with different meanings:

If you mean "frugal":

* Thrifty

* Economical

* Prudent

* Cost-conscious

If you mean "generous":

* Giving

* Charitable

* Benevolent

* Magnanimous

If you mean "reluctant to spend":

* Cautious

* Reserved

* Value-oriented

If you mean "meticulous":

* Careful

* Attentive to detail

* Precise

Please provide the sentence so I can give you a more precise answer!