I also switched to Niagara Launcher, and it's great especially with the new icons update (everything looks so consistent)! It decreased my usage as well but I still find myself going back to old habits whenever stress mounts, despite having Niagara Pro, enabling Morning mode, and Notification summaries. Any tips you could share that have helped you further decrease your usage?
Do not put the apps you want to reduce usage of in your favorites. The act of pulling them out of the alphabetized list or searching for them when you want to use them adds just enough (for me) friction that it becomes a necessarily deliberate action.
Niagara is very clean and a unique take on launchers. I don't need to fiddle with "home screens" anymore and just have my most used apps right there. And for the less frequently used ones, it's just one swipe with my thumb (see the demo) or with a more targeted search. The launcher was designed of having one hand (primarily thumb use) to use in mind. It prevents me from going down the rabbit hole of adjusting widgets and swiping a lot to find things.
It also has a new update on icons. I finally now have consistent icons even for rare apps (e.g. specific to your country/locale) after a long long time. It honestly feels a lot better when specific apps (designed to catch your attention with the "notification dots") don't stand out.