Children will pick up cues from their adults so tackling your own behaviour first is the most important step.
It's also important to not just praise your child but to teach them how to praise themselves- what did they think they did well today, at the park, at the shop etc. Talk about self praise a lot, feeling proud of oneself, feeling pleased with own achievements etc. Self praise is totally necessary for a content and confident child AND adult.
Ask her opinion on things and value her answers but be honest.
You- 'do you think we should have chicken or fish for dinner?'
DD- 'chicken!'
You- 'I'd quite like chicken too, but we'd have to stop at the shop on the way home and it might take too long...'
Etc
Simple, calm problem solving and processing thoughts are a really good way of demonstrating so many different skills as well as showing you value your child's input and encouraging them to think for themselves and outside the box.
Praise her for effort, spontaneously. Train yourself to notice her doing things at various times and remark on them, even if it's things she does regularly. 'Thank you for coming so quickly when I called you for dinner, it really helps if we're running a bit late', 'you concentrated really well then when we were reading, I really enjoyed reading that story with you'.
Try to avoid heaping the praise on if she's doing things purely to gain praise- if you need to say something about it, flip it round so it's coming from her 'that's really nice you wanted to help your sister with your shoes, did you notice she needed help then?' It encourages self praise rather than external validation.