Custom font only appearing on my device?

Hi! Although I have read many many squarespace forum questions intended to solve the exact same problem I am having now, I cannot make the custom font I have injected work on any device other than the computer I uploaded the font from. I initially believed myself to have gotten the custom font to work on my header, but that is merely a PNG file I uploaded. If anyone can point out what I'm doing wrong I would greatly appreciate it 🙂 I have included a screenshot of my janky code below, as well as linking to the unfinished site.

Thank you for replying! @tuanphan 🙂 I thought I shared the site URL, but it seems I didn't. Either way, since asking this question I just figured it out. I am so sorry to waste everyone's time! I struggled with this for a week and then asked the question and figured it out (facepalm) thank you so much for your help and I hope you have a good night!

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I just figured it out.

Could you share what you figured out for others that may follow on?