Living in the north, I get Early Blight every year and I do not spray. I believe that people who do spray use Daconil. If you remove all the diseased leaves from the plant as soon as you see them, the disease should not spread. It always starts at the bottom of the plant, so I always remove all the lower leaves up to a foot from the ground to reduce the possibility of blight splashing up from the soil when it rains (even though I use mulch) and that keeps it at bay, then I remove diseased leaves whenever I see them. I get to harvest tomatoes until frost so it's really no big deal for me

Here in the north, Early Blight does not survive on the soil or cages because it gets so cold here in the winter. You would probably need to sterilize any cages/stakes with a 10% bleach solution, and I would remove the soil (and use it in the flower bed). For us, Early Blight and its friend, Septoria, blow in on the wind and come down in the dew and rain :(.

Good luck with whatever you choose to do.

Pull the tomato, turn over the soil, let the sun shine on the area for a week or so, then plant with marigolds. Marigolds because your soil may infect a newly planted tomato plant, and because where I live, marigolds repel pest bugs that tomatoes attract.