First off, welcome to the site,
@NtxMelanie !!! You've got a really sharp looking installation there. When I used tabs and shock, I used to keep them in a deck storage bench / box with those pneumatic pistons. The exposed part of the pistons rusted and the box just constantly reeked of pool chlorine. Now I only keep a few tabs and dry CYA on hand, both in the garage with their own bucket with threaded lid. No chemical smell in that large a space. I keep muriatic acid outside near the pool because my water drinks the stuff by the gallon, and it's my understanding that as long as the jug is sealed it retains its potency indefinitely. Same with tabs and dry stabilizer, kept sealed they stay effective a long, long time. Liquid chlorine and your test reagents are the big worries because they represent the biggest percentage of cost to run the TFP method. LC loses its potency around 90 days after manufacture and is susceptible to light and heat, so make sure you're checking the
Chlorine Date Code when you buy.
As you learn more about CYA / Chlorine balance, you'll get the hang of things pretty quickly. Like folks have already mentioned, CYA levels essentially never drop unless water is removed and replaced with fresh water. The good news is it looks like your pool is on the smaller side, so even if you've got to get drastic by draining some of the water to lower your CYA levels, it shouldn't be too much of a chore.
It looks like you've got enough equipment there that you probably have some Pentair automation controls? Either way this is a really great install because you've got flexibility out the wazoo (industry term) for adding things like Salt Water Chlorine Generation down the line. There's no need for you to use the ozone generation system on an outdoor pool, the sun's rays are more than enough to neutralize combined chlorine.
Great job and ENJOY THE POOL!