Forum power point corporate presentation

Hello, I am looking for work to improve an existing 25 slides power point presentation. The project is for a presentation of the Global Investment Forum ( https://global-investment-forum.com/).
We need to brand the document better, visualise certain info better, leaner and more appealing. We need a strong understanding of corporate visual culture as this is for an annual forum in the finance sector.
The job will lead if well done to other opportunities (logo redesign and more).
We also need the work to be done before 15 December- we're assuming it's a half-day job more or less.
thank you!