gmail and microsoft keeps marking my emails as spam

I am looking for some advice for my mail server setup for my domain

sherwood.fun right now its a hobby project while i am being laid off

i have setup my mail server using

Centos 8
Postfix v3.3.1
Dovecot v2.2.36
Secitogo PositiveSSL (DV)
opendkim v2.11.0

and i am always getting marked for spam by gmail and Microsoft

here is my dns records

v=spf1 a mx ip4:23.239.16.109 ~all

_dmarc v=DMARC1; p=reject; rua=mailto:webmaster@sherwood.fun;

default._domainkey
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDTqKoKd9SjxbLkI7XPxnUDXtm0DojU4L3bfblItTY+rLpbkXjfNHcix+9NshW7+Aw41jV3CFhGP7fet50UPRq3WLR9SAkSnHfDlEHVaBbW/CX6DZ4JbCGVN8kbCH93fuGkZURZhujkkC3LqEkP6pumcCFRk/2aUNCRW7sPCxzW/QIDAQAB