SendGrid emails ending up in SPAM folder

Hi, we are looking for someone with experience with SendGrid, we send around 25,000 emails a day, our problem is that most emails end up in the SPAM folder, we have contacted support and done all the adjustments they told us, but still the same, if you have experience with this, please bid with the word: "sendgrid2022", and it's good to mention that we only send job offers to our subscribers, there is nothing bad with the email content, budget: $50