Hi @Anujtyagi, welcome to the community!
I’d encourage you to start by comparing the number of deliveries for each email in the flow within the last 30 days, and the 3 months leading up to that. If there’s a significant drop, it might tell you something about the flow trigger being broken, or indicate there’s another factor impacting the flow engagement.
For the abandoned cart flow; what ecommerce platform are you integrated with? There might be something about that integration that’s broken and not correctly triggering the “started checkout” event that sends people into the flow.
If you have a paid Klaviyo account, it would be useful to get on live chat and ask Klaviyo support to help you examine that. They have access to backend data about your ecommerce events that can help you more specifically.
For your welcome series flow; have you noticed similar changes in your optin rates? Is traffic to your site down overall?
These are good places to start. After you’ve checked on those things, then I’d consider the content of the flow. Sometimes a drop in engagement means the flow content is no longer resonating as much as it did before, and it’s time to try something new with your offers and copywriting.
You might also find this related recommendation from @David To helpful for troubleshooting your revenue changes.
I hope this helps!
~ Gabrielle