You don't need to stop informing others, I think stopping is bad. Just tune it down a bit, don't overexert yourself with it. Most will not care but it's still important to tell it to them. At some point, they might realize why it's a good idea.
Also, Google isn't immediately killing Ad/Content Blockers like uBO, they're doing it slowly. Which is much smarter. It will mean less resistance. Boiling the frogs (users) slowly has always been the best way of eventually reaching a certain goal, without too much resistance along the way. If you push the goal too fast and too hard, there will be massive resistance, backed by an immediate media backlash. You have to wait that out, spread it out, so that users and media forgets about it again. Also, uBO Lite for MV3 browsers is less effective, but many users won't notice a difference yet. Next steps will probably be to make it less and less effective over time, while claiming it will be better for the users overall, like offer better security from malicious addons that almost no one installs anyway, or whatever.