Cluster Points expire; they are valid for up to 1 year after the last time you have accquired points. If you do not earn new points for a whole year, all of your points will expire.
E.g.
Total CP: 10000
Last Acquired: 100CP on 07/01/2023
→ If no new CP are acquired by 07/01/2024, your total CP will be 0.
Exchange Tickets do not expire.