I find that my personal favourite strategy is to start in Dark Forest; we did that on our most recent visit, and we got a walk-on queue for Rita and a 15-20 minute queue for Thirteen, so we nailed 2 of the big 7 within the first hour of our day!
This turned out to be a helpful strategy for ride count for us, because both rides had queues exceeding 1 hour later on...
I think Forbidden Valley would work similarly well, but the Dark Forest rides generally have lower throughputs, so it takes less people to make those queues long. I find that Rita & Thirteen can often build up quite a queue later in the day (often over an hour, close to 2 hours), whereas Nemesis & Galactica generally aren’t ever particularly long for the most part (relatively speaking, of course; they’re still usually at least 30 minutes).
But each to their own, I suppose! Everyone has different ways that they like to go about enjoying their day, and one of the beauties of Alton Towers (or any theme park, for that matter) is that there’s no right or wrong way to navigate the park and enjoy your day!