Use a different email alias for each site. Duckduckgo with their duck.com, or Apple’s Hide My Email makes that easy; let your password manager keep track of the alias. If they start to spam me, I know not to use that site again, and I can delete the alias so that the spam goes into a black hole.
Spray water (fine mist from a bottle) on the inside of your windows and use it to stick aluminium foil to the glass, shiny side out. I do the top ⅔ of the north-facing windows (I’m in the southern hemisphere) each summer and it reduces the indoor heat significantly.