Hi @KBOARD,
Welcome to the Community! Thanks for posting your question regarding open rates here. Hope I can provide some info for you!
You are correct that there are a few suggestions that we make to increase the open rate. Firstly, creating an Engaged Segment and specifically targeting these Profiles with relevant content and then monitoring the Deliverability Performances for these emails. I do advise that you do review and follow this article on How to Improve Low Open Rates. If your delivery rate is low you will want to participate in List Cleaning which will assist with this.
In addition, I found some great community articles regarding this topic too:
You have taken great steps so far and I think you’re on the right path to helping your open rates!
Hope this helped!
Alex