For me, it’s a few things.
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A way to burn time that doesn’t feel like a digital sugar rush.
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Support, camaraderie, and kindness, primarily from /r/stopdrinking.
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Niche stuff, like ideas for local hiking and backpacking trips, propaganda posters, and kayaking info.
The various subs that can help you get your life in order, in the way you chose. personalfinance and/or financialindependence, whatever diet sub to help you learn how to eat better and get recipes that fit the diet, exercise subs like weightlifting or some others. Things like that can have a huge impact not just from the community encouragement, but the knowledge that they include in the sidebar, etc.