It would be a good idea to renew it before it expires, so you could renew it for 1 year by passing any specialist (CCTA, CCTE, etc) exam or for 2 years by passing the full-blown CCSE exam. Once your CCSE expires your only path to renew is the full-blown CCSE exam. There used to be a "CCSE Update" exam that you could pass to renew/extend your CCSE cert but that exam has been retired. See here: sk163417: Check Point Learning & Training FAQ
Attend my 60-minute "Be your Own TAC: Part Deux" Presentation
Exclusively at CPX 2025 Las Vegas Tuesday Feb 25th @ 1:00pm