think many people have this misconception
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Recently I saw many posts where they discussed how JUST setting up DKIM, DMARC AND SPF didn't automatically fixed their deliverability.
The thing is, DNS set-up is a basic thing. It's not "everything"
Engagement.replies. click. opens. These things are one of the biggest factor which determines where your emails will land.
If you are sending emails to 100 users and only 1 of them is reading your email then obviously you're emails will land in the spam.
So here are the steps what you Must do.
proper DNS set-up
List cleaning
list segmentation
Send value based emails and try to get as much clicks and replies as possible.
Don't be too Salesy or promotional.
Do these things and your emails will stop landing in the spam.
NOTE: You don't need to delete users in your list who aren't engaging. Keep them in seperate list and there are strategies to bring them back.