Hi again Titus! Starters can be confusing at the best of times, and those first days of feedings see a lot of changes. The slow down in fermentation on days 4,5,6 is perfectly normal. New bacteria are starting to form and it changes the behavior of the starter. Keep up with the feeding and by day 6, 7 most starters show more growth again. It will be more moderate than when you first started, but it's really what you're shooting for.

We have two excellent troubleshooting guides for starters online here:
https://www.kingarthurbaking.com/blog/2018/03/09/sourdough-starter-troubleshooting-2
https://www.kingarthurbaking.com/blog/2018/03/12/sourdough-starter-troubleshooting-part-2

We hope you find this information helpful. Don't forget to check out our Complete Sourdough Guide, too!
 

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