Solve our Email Marketing deliverability issues

Job ID: 35652499

Budget: ₹37,500 – ₹75,000 INR

We are an IT services company and have been engaging in email marketing exercises.
Off late our email marketing deliverability has taken a hit. We have an open rate of less than 12% and most of our emails are being delivered in the junk folder.
We have tried multiple ways like buying new domains, training them for inbox delivery, but seems like we are still not able to see them hit inbox.

Require someone who has solve this before