Opportunity Stages and Long Term Drip Marketing

I am fairly new to SuiteCRM and CRMs in general. Wanting suggestions for how to organize the system better. I have opportunity stages set up, but not sure how it would be good to organize the people that I have gone through several stages but they stop communicating with me or have not made a decision. I do not want to mark them as just a Lost or Won opportunity. I would like to move them to a long term drip category to continue to market to them and do not want inflated/inaccurate opportunity stages.

What methods do other SuiteCRM users use to handle opportunities that are not as likely to close because they are not continuing to progress through the opportunity stage cycles?