I love Daiquiris and this is basically a classic Daiquiri with a few bells and whistles: orange curaƧao, lime juice, almond syrup, amaretto, falernum...
I made this for my wife and she loved it. I made another from the Gary Regan book and I liked it too. My wife's had the JDT Falernum in it. My bottle has been opened but refrigerated since April 28 2021. Since it was a small amt I risked using it. Seemed ok but perhaps a fresh bottle would do better. Thoughts on whether it should be tossed by now?
John D. Taylor's Velvet Falernum is only 11% alc./vol. - not strong enough to prevent mould (over 16% seems to be the magic number). However, the 11% will help preserve and you have kept refrigerated. If no mould is visible in the bottle then I'd continue to use it.