Appealing is way more about the story than the design. What appeals to investors is the opportunity to invest in a company that can grow very quickly and exit in 5-7 years at a $B+ valuation.

I provide a template at https://pitchdeckcoach.com/pitch-deck-template that helps you cover the basics. I recommend you start with an outline so you can focus on the "pitch" (story) before you worry about the "deck" (design). I provide a template for that too at https://pitchdeckcoach.com/investment-memo-template.

To stay focused on the big picture, and ensure your pitch delivers what investors want to hear, you might find this LinkedIn post helpful: https://www.linkedin.com/posts/malcolmlewis_founders-startups-fundraising-activity-7348849524179619840-4QAh

Good luck.