Email goes to spam folder on GMail

Hi, im a System Administrator. i have setup WHM cPanel and tested all the domain and spf, dkim validated. email deliverability (whm) : all valid talosintelligence.com (cisco) : good mail-tester.com : 10/10 mxtoolsbox.com (mx lookup, blacklist, spf, dkim, dmarc): all good without warning after do few testing sending, the email sending to gmail still ended up in spam folder. what i might miss out here? Thanks