Hi @jonatales1 ,
I apologize for your experience! We'd love to help get you back up and running. We have tons of guides on things such as improving your open rates, finding the best time to send an email campaign, and optimizing your subject line for deliverability. We also have tons of resources for collecting and maintaining your contact list, and segmenting and removing contacts who are no longer engaging.
If you wanted to dive a little deeper, we do have a program called Marketing Advisor that has proven to be really useful to a lot of folks in regards to driving engagement.