Bonide Captain Jack's Copper Fungicide, 32 oz Ready-to-Use Spray for Organic Gardening, Controls Common Diseases

First, great garden setup! Second, clip those lower branches off, you don't want leaves touching the soil. That goes for the pepper and tomatos. Then some fertilizer specifically nitrogen. I use https://www.amazon.com/dp/B000UVR656/ref=aod_recs_desktop_prsubs_1?th=1 I also love copper fungicide for tomatoes. https://www.amazon.com/dp/B000UJVDXY? Good luck!