I do have a standing desk and I love it that I can adjust the height and wouldn't replace it with a stationary one but it's not the magical fix for the extremely destructive effects of prolonged sitting that many pretend it to be.

Standing desks are, at best, something that reduces those extremely destructive effects of sitting by something like 5%. Which doesn't matter one bit because the nature of the health destruction by sitting is that it kicks in after you go past certain time of sitting. Taking a break from sitting doesn't help much. 5-30 minutes later you're back on the chair and the cumulative negative effects from the sitting for the day are more less the same as a result.

Let's not dance around it: you should apply a non-negotiable maximum amount of sitting at the computer per day (depending on your health that is basically 3 to 5 hours) or else you'll need electro-stimulation and vibro-massage every day just to reduce the chromic tiredness by a little but still end up rapidly losing health from one point and on anyway.