Reactive Dog JRT mix (Please check out!)

I have a small JRT mix (About 12 pounds) who has some of the worst reactivity issues. He’s about 9 months old, but screams and barks like it’s nobody’s business whenever there’s a dog or person near by.

I’m a younger teenager, so I’m not able to get a job to hire a trainer. My parents have already refused to get one.

He’s both people and dog reactive, and very loud about it, which is probably the worst part about it. He hates being approached by other dogs, especially. I believe this is mostly because a few months ago we were attacked by a large black shepherd mix. (Might be fear based reactivity?)

I’ve tried for months to get this issue under control, but I’m at my wits end. No method has worked with him, but I don’t want to just give up.

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Any advice will be VERY appreciated. I will respond to most things in this thread if possible so that we can all attempt to clean up this mess.