I also want to buy less stuff / waste less. I'm trying to ask myself "do I need it?" and "do I love it?" about purchases and not buy things for bad reasons like 'but it's on sale' or 'that looks nice'.
Also recycle/donate/give away things we don't want/need/use. I'm going to try and get rid of one thing a week.
One of the first Mastodon instances, there is no specific topic we're into, just enjoy your time!