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help with black spot on roses

I have a few roses I grow in containers. Two are knockout roses from Home Depot, one is a mini rose variety. I noticed this year that the most established of the roses started having spots (darker green on leaves that turned darker) a few leaves and first but spread quickly. I read that it’s black spot. I tried spraying with neem oil and fungicide several times. I also removed the leaves that seemed to have damage and pruned (after it had its first blooms). Now I’m seeing some leaves fully drying out. Is there anything else I can do? Is it something else? Here are some pictures of how it looks now (more pictures in first comment). Any advice would be greatly appreciated. Would like not to throw it away…

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