Start with a full inventory
List every card you actively keep, then capture the benefits that actually matter to you: credits, lounge access, reimbursements, protections, and status perks.
The simplest answer is this: keep one current system for every card, review it regularly, and make benefit status visible enough that you do not have to rely on memory.
Credit card perks are easy to underuse because they do not all behave the same way. Some reset monthly, others annually. Some matter only while you are booking travel. Others are useful only after something goes wrong. If you do not centralize that information, the friction of checking it is often high enough that you skip it.
List every card you actively keep, then capture the benefits that actually matter to you: credits, lounge access, reimbursements, protections, and status perks.
A benefit list is not enough by itself. The useful part is knowing when something resets, how often you should review it, and whether it has already been used.
The fastest way to lose value is to forget whether a credit was already claimed. Every benefit should have a current status so you can tell what is still available at a glance.
The real decision is whether your system helps you act before value disappears. If the answer is no, the format does not matter much. A better system is the one you will actually check before a deadline, before a booking, or before the next annual fee hits.