Fix domain reputation in GMAIL

I have a .eu.com domain that does get flagged as spam by GMAIL only. All DNS records and DKIM signing are properly set, the mails get a 10/10 score on mail-tester, but on gmail all messages go to spam. No marketing emails, only transactional and the domain is over a year old. No other domains on the same server get flagged. Place an offer only if you are sure if you know how to solve this issue. Contact me if you need to do an assessment prior to placing your bid.