I have a similar experience, only visiting reddit for stuff like tech problems and very niche communities. I had never willingly visited the reddit homepage since.
There are a lot of posts now on lemmy compared to before the reddit fiasco but is not like the activity on reddit. The good thing though is that it made me stop my habit of mindlessly scrolling through endless content.
The other day, a place in the Philippines recorded a Heat Index of around 58 degrees Celsius (136 F). That is classified as Extreme Danger and most places have heat index a little bit lower than that.