Tracking Customer Marketing Attribution: Seeking Scalable Solutions

Happy new year all! One of my resolutions is to become more active in this lovely community that has helped me so much. I'm curious to know how others are tracking customer marketing attribution on expansion efforts. I currently have a scrappy way of doing it where I consolidate all email clicks, webinar engagement, in app message engagement etc and cross reference it with salesforce upsell opportunities. While webinar attendance and form fills are already logged in SFDC as activities, the more granular click/interaction data isn't due to the need to prioritize which campaigns are relevant (i.e. unpaid feature updates don't count). Has anyone found a scalable solution for this?