New to chlorine

Hi! Newbie here! I’ve been reading up trying to learn about the BBB method and the chemistry/balancing of pool water.
I have a 18ft round above ground vinyl pool approx 6000 gal. It’s got a sand filter.
I used to use Baquacil but this yr changed to BBB method.
I got a Taylor K2006-C test kit.
Here are my readings currently:
Free Chlorine 3.8 ppm
Combined Chlorine 0.4 ppm
Ph 7.2 ppm
Total alkalinity 170 ppm
Calcium hardness 90 ppm
Cyanuric Acid: not detectable

I think to raise Ph to 7.4...

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