DMARC issues with GMail

I received a DMARC report from GMail, and recipients indicated my emails went to spam. Here's the report:

<feedback>
  <report_metadata>
    <org_name>google.com</org_name>
    <email>noreply-dmarc-support@google.com</email>
    <extra_contact_info>https://support.google.com/a/answer/2466580</extra_contact_info>
    <report_id>501446162164090683</report_id>
    <date_range>
      <begin>1679270400</begin>
      <end>1679356799</end>
    </date_range>
  </report_metadata>
  <policy_published>
    <domain>sherief.fyi</domain>
    <adkim>r</adkim>
    <aspf>r</aspf>
    <p>reject</p>
    <sp>reject</sp>
    <pct>100</pct>
  </policy_published>
  <record>
    <row>
      <source_ip>2607:5300:205:200::279f</source_ip>
      <count>2</count>
      <policy_evaluated>
        <disposition>none</disposition>
        <dkim>fail</dkim>
        <spf>pass</spf>
      </policy_evaluated>
    </row>
    <identifiers>
      <header_from>sherief.fyi</header_from>
    </identifiers>
    <auth_results>
      <dkim>
        <domain>sherief.fyi</domain>
        <result>fail</result>
        <selector></selector>
      </dkim>
      <dkim>
        <domain>sherief.fyi</domain>
        <result>fail</result>
        <selector>2023b</selector>
      </dkim>
      <spf>
        <domain>sherief.fyi</domain>
        <result>pass</result>
      </spf>
    </auth_results>
  </record>
  <record>
    <row>
      <source_ip>2607:5300:205:200::279f</source_ip>
      <count>2</count>
      <policy_evaluated>
        <disposition>none</disposition>
        <dkim>fail</dkim>
        <spf>pass</spf>
      </policy_evaluated>
    </row>
    <identifiers>
      <header_from>sherief.fyi</header_from>
    </identifiers>
    <auth_results>
      <dkim>
        <domain>sherief.fyi</domain>
        <result>fail</result>
        <selector>2023a</selector>
      </dkim>
      <dkim>
        <domain>sherief.fyi</domain>
        <result>fail</result>
        <selector>2023b</selector>
      </dkim>
      <spf>
        <domain>sherief.fyi</domain>
        <result>pass</result>
      </spf>
    </auth_results>
  </record>
</feedback>

MXToolbox doesn't seem to show pertinent problems in its report: https://mxtoolbox.com/emailhealth/sherief.fyi/

I'm not sure what's going on here (I lack enough domain experience / knowledge). Any pointers to start looking into?

mjl- / mox

DMARC issues with GMail #21