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But would it gain something? I'm wondering if HTTP/3 could be enabled in one of my websites, which is even much smaller, and which has no blocking requests. I don't mind if the gains are small, as long as the impact is not negative for most visitors. I'm mostly concerned about some of my visitors visiting the website through an unreliable connection (mobile).

It should gain a small amount; it is a more efficient protocol, with better compression and including 0-RTT for repeat visitors. But I doubt it would be noticeable on such a light site.

The main thing it would get is 2x faster loading on high latency networks (because the TLS handshake happens with the same packets as the QUIC handshake).

Yes, I use this site as the paragon of page weight. When other sites I visit are routinely throwing 200MB (MB!) pages at me, this site is throwing 60KB, of which 54KB is content! It's the benchmark I measure all my design against.