stretching was a lesser fad back in the 80s, following the Airobics craze...
And since then much has changed in terms of knowledge...
The old old idea was to bounce the stretch, which has long since been debunked and replaced by static stretches, to be held 15 seconds or so, repeated at least 3 times. When i was in class (martial arts) we never had time to go longer than 10 seconds, time was precious! And yet, going 3 times a week the flexibility improved. (but then again, I was 34 and naturally flexible)
Then the program changed to add a set of dynamic stretches to the workout routine: You'd do the same moves, but instead of holding the stretch you'd move on to the next. So if you sat on the floor with spread legs, you'd lean to your right leg, raise up, reach down the middle, then to the left leg, without topping to hold it at the stretch point. Then you'd repeat that two more times. Sometime later in class the traditional stretch would be done with holding.
However, we also had various other exercises that improved flexibility over time. One was called 'focus kicks' where we held on to the wall or door jam and performed sets of 10 or 15 of our various kicks in slow speed, concentrating on proper for, always reaching for the limit of flexibility. Burn, baby, burn! I am not sure how you can translate that into skating, as it, too , is a dynamic process.
I have always been a huge fan of ballet exercises: it's low impact and - come to think of it - dynamic in most parts.
I am not talking about dancing, but the barre exercises, which - if done correctly - can leave you drenched in sweat in 15 minutes without running or bouncing.
But to tell you the truth: a few month is really too early to expect huge changes in flexibility, especially if your muscles, tendons and ligaments are naturally tight. Mother nature might have dealt you a bum deck there (but it does have it's advantages, too, nice protection from joint dislocation) and you just have to work harder at it. Of course, coming from a sedentary lifestyle has you at a worse starting point than a previously active person.
Just keep working on it! Eventually you will realize that, dangit, that leg really does swing up higher than it used to. But chances are that you won't realize it much, since it's a gradual process!