Query - Reliable DNS Blacklists for Mail Servers

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Hello,

I am currently working on reducing spam before it even reaches the filter. Using DNSBL for this purpose seems to be a good option for me. After conducting some research, I have identified the following reliable options:

1. zen.spamhaus.org
2. spam.spamrats.com
3. b.barracudacentral.org

Despite the good reputation of these blacklists, I am still seeking better detection methods. I continue to receive around 40-60 spam messages per day, all of which are correctly identified and marked as spam by the filter.

Do you have recommendations for effective blacklists that minimize false positives? Additionally, I welcome any other suggestions.

My current settings include:
- Activated DKIM and DMARC for incoming mail
- SPF checking mode set to softfail
- DNSBL activated using the aforementioned list

Thank you in advance for your assistance.