Need An Email Delivery SPF DKIM DMARC Expert

Gmail is rejecting our email and the bounce errors all mention that the reason is due to "unsolicited mail. We need someone to rectify this on Klaviyo so we can start sending again. It appears to be a DNS-related issue. Perhaps something DKIM/DMARC related. Not sure. If you’ve had previous experience solving this issue please give me a short brief on how you’re going to solve it for us. To be a best fit for this project, you need to: 1. Be able to articulate (briefly) how you’re going to tackle the issue 2. Be attentive to detail and committed to getting this done by Monday EOD. If you’re interested please submit a proposal with the numbers 3-1 written backwards a “w” between each number. AI/ChatGPT proposals are going straight to the trash!