I take guanfacine. It’s an older blood pressure medication that happens to treat adhd. I also have high blood pressure so I get an added bonus. Stimulants are great for laser focus. Guanfacine helps with focus but its biggest help, for me, is executive function and curbs some of my emotional effects of adhd. I notice I’m not as sensitive to feedback or criticism.

The return path sender certification will help with inbox placement but you have to maintain good reputation (low spam and bounces). If you are on a dedicated IP it will take some time for the reputation to improve...give it time. But if your spam and bounce rates are high it will never improve.

Also signup for hotmail sdns and fill out the yahoo bulk email sender form. hotmail sdns can help you figure out where your issues are with hotmail. filling out the bulk sender form will help with placement at yahoo. Its all about maintaining a consistent and good reputation...so if people are not marking your mail as spam and you aren't bouncing lots of email your reputation will improve over time.

Since you are doing this on your own I am assuming you want to continue down that route but if you want ESP recommendations contact me offline so I can learn more about your situation.