Thank you all for your kind replies, i fixed the issue!
Checking this site “https://talosintelligence.com/reputation_center” found out that my IP address “aaa.aaa.aaa.xxx” was really new and other ips with the same numbers in the first three sections of the ip had neutral reputations too.
Also checked my old ip for the server that works “bbb.bbb.bbb.xxx”, found that a big list of ips was using the same first three sections of the ip including mine, and had a good mail reputation.
So asked my vps provider to change my ip to “bbb.bbb.bbb.xxx”, reinstalled the server, and now all my emails are sent to the inbox folder 