Before adding anything for a new season, make room to see what you already use. A smaller shelf begins with a decision, rather than a purchase.
Put the familiar things first
Take a moment to look at the products you reach for most mornings and evenings. These are the useful starting point. A bottle you enjoy using does not become obsolete because the calendar has changed.
Group the rest by role: cleansing, serum, cream, sunscreen. If several products occupy the same role, decide which one you want in your current routine. You can keep an unopened alternative aside without making it another daily layer.
Check before you keep
Look for opening dates, storage instructions and any expiration information. If you cannot remember when something was opened, ask the brand for guidance rather than guessing from the amount left.
Set aside products that have changed noticeably in odor, color or consistency. Keep the label and batch details while you ask about them. The fact that a bottle was expensive is not a reason to overlook a change.
Write down a morning and an evening
Make two short lists using the product names you actually own. Include your cleanser and daytime sunscreen. Leave optional steps out if you cannot say why you want them there.
For an Ozera routine, the serum comes before eye gel and cream. 004 belongs in the morning; 003 belongs on the evenings you use retinol. Those are roles, not a requirement to own both. The routine guide is there when you need the order.
Let the next purchase wait for a reason
Use the shorter arrangement long enough to understand whether it fits your day. Notice what is convenient and what you consistently skip. Those observations are more useful than a list of seasonal essentials from someone else's bathroom.
If you eventually add something, give it a clear place and introduce it on its own. A new season can be a moment to reconsider your shelf. It does not have to mean replacing it.
Keep what earns its place. Leave some space around it.
Further reading: FDA: shelf life and expiration dating of cosmetics
Photography: Noah Blaine Clark / Unsplash. Editorial photograph.