The clever people are those who keep quiet about where they are going and so if it goes Amber while you're there you can happily do what you want when you get back.I have colleagues who were hitting the ceiling with excitement about Ibiza being put on the green list ... so they went and booked trips for mid August! I mean, do what you want, but if you can get the leave and you really want to go, I'd be booking to go in the next 2 weeks or so.
I was meant to go last summer to Thailand and we haven't rebooked our flights yet (we have vouchers) - they are opening Phuket I think really soon as a sandbox scheme and hoping to reopen the rest of tourism following that. I'm hoping to rebook for next year sometime too.
Worked for us last year. It is horrible not being able to talk about your holiday though.