It's also helpful to have a reliable hygienist check how you're going until you get it right. I'll probably end up going about every six months in any case, with healthy gums. Which is much better than "I would hate to see you lose all your teeth." which is what my hygienist said before I got serious.
Finally, I've only been brush once a day, before bed for two reasons. First to check how well things were going and second, to avoid too much wear and tear on the gums in case it wasn't necessary. As it turned out I'm fine with once a day. The primary way I check between check ups is to floss about once every two weeks. If my gums bleed then it's a sign I'm off track. Before I started this technique my gums would almost always bleed.
Do you mean that your gums were shrinked and then growed back to their full height? Or that they were sore and not anymore?
I notice though that neither my hygenist's or my dentist's office has been handing out information about this approach. Not good for business perhaps. I believe this technique works via abrasion so toothpaste is a must. I use a Braun 4000 but any sturdy electric toothbrush should work.
[1]https://www.bbc.com/future/article/20220718-the-best-way-to-....