UI/UX Improvement on existing mobile app

I'm looking for person to provide UI/UX Improvement for our mobile app at https://apps.apple.com/my/app/biosof-smart-metering/id1521605471?l=ms
- improve aesthetic
- improve user friendliness
- propose new logo / icon
- make the app fun to use

deliverable
- hi-fidelity design (AI / PSD) of every screens
- simple write up of justification for the design decision

duration
- 2-3 weeks