Your website is excellent, and it was fast some time ago.

I remember that at the time you were using http/2. For some reason it got disabled and you are now using http/1.1.
Please re-enable http/2, you're even using cloudflare so you can easily, with a flip of a switch enable http/3 which massively increases your website speed.
This isn't a big change, and it's an easy one, everyone wins.

Also, you get more points since you're already using IPv6. Kudos 💪💪💪.