Hi @Stay - Welcome to the forum.
Short answer is no. You can’t further optimize forced loaded assets, only optional ones. Staying away from Google fonts is helpful and loading your own font files from the project will improve overall load times and metrics is you use additional fonts. Webflow serves monolithic CSS and JS versus breaking the files up which is a real issue.
My WP sites get much higher scores because I can control everything. From what assets are loaded, when they are, and how. My custom-hosted and built WP sites are hitting high 90s on mobile. When JQuery is not needed and then not loaded, 100. These are sites where the best I could pull was low 80s on WF. In pagespeed.dev the webflow.com site is a 36 on mobile with 54 seconds for time to interactive and does not pass core web vitals plus it has a pitiful 16,270 ms total blocking time. Wordpress? 90 and passes CVV with 4.8 second load and 20ms total blocking. I guess when you primarily rely on advertising, it doesn’t matter.
There are other considerations as well.
In WP, you can theme a post, by tag, by individual category, taxonomy, etc., whereas the limitation of one collection template in WF. Conditionals in WF are not an equivalent feature since the content is hidden through CSS but still loaded by the browser. My clients have told me they prefer the freedom of using Gutenberg over RTF editing in WP. In WP, the user can easily add complex content and content layouts, columns created, photo galleries implemented, forms inserted, etc… I agree with them. Another significant pain with WF is post publish dates that will change on import, listing post archives, RSS, membership limitations, post limits, and more.
What features would you gain by migrating? If the answer is designing control in WF, there are now excellent page builders that give you complete control at a more granular level. When considering platform changes, you have to take much into account. Hosting? There are plenty of quality high performance options available. I host all my WP clients with no issues and blazing fast page delivery.
I like many things about Webflow, and it is the right fit for some of my projects. I don’t personally recommend using it as a blogging platform. This should not be read as a bash against WF but rather observations from real-world personal experience. Hope you find this helpful.