I have the problem of spammers sending emails faking they are from my domain but through hacked computers. So I get thousands of rejects. DMARC shows you wher

I have the problem of spammers sending emails faking they are from my domain but through hacked computers. So I get thousands of rejects. DMARC shows you where it is happening, spf can cause some of it to get blocked, but you are stuck with anyone can make up email addresses and send them out through other mail servers and in-turn your domain is certainly going to start going to spam due to this.