To become a Senior Associate from your current Associate position, focus on doing your job exceptionally well and taking on extra tasks. Show that you can lead and work well with others. Don't hesitate to ask for feedback to improve. Learn new skills that are important for the role, and always be willing to learn more. Your hard work and dedication will pave the way for your promotion to Senior Associate.
If you are interested in getting into this field, then do check out this video about Raju Saha and how he got various job offers and placed in Top MNC just after completion of the Splunk Architect Master Course.