Have you created the abandon checkout and abandon cart flows yet? If not then get onto it ASAP. Those are 2 of the highest revenue flows. Then ensure to turn off the Shopify automated version as it will be duplicated on top of your klaviyo versions. Check the 5 Essential Flow module in the free course getting your first sales. That will help out a bunch. As Oussama said you could even manually reach out to the highest abandon carts to try push them over the line. Calls are a tad intrusive in my opinion. But, personalised text emails can be good. But, really, your abandon flows should take care of it. But, remember it's a volume game. If your conversion rate on your site is 1% then expect a sale to come through when 100 people go through it. it should be a bit better than that as it is targeted but it's still a volume game!

@Oussama Digitale oh right. Sorry about that. I completely misread the question. Immediate first email. Then 1 day apart for each email. Very important to send quickly whilst people are interested

@Oussama Digitale I would not put a specific time of day. I think having a time preset in the flow is a huge problem for klaviyo. It should go out 24 hours after they sign up. If they were available at that time of day to browse it is likely that is a regular time of day they have spare time. So always each email in all flows should go out 24 hours or exactly days apart. No specific time. Apart from the first email in the abandon flows. That is just 2-4 hours later

@Oussama Digitale personally I wouldn’t because you should only split test one change. For example x to close the form vs only button. You can’t add a third or fourth test to that as there are only two options. Testing different offers like % off or dollar amount off. You can’t test more versions. It’s generally either or. Patience is key when it comes to split testing. It should take a month to get to a optimised form. Unless you get very low traffic under 100 visitors a day.

@Oussama Digitale split testing 5 and 35. If 5 wins then split test 5 and 25. Always keep the winner and adjust the loser down or up.