Some suggestions could be- customised balloons or customised hampers with a champagne and other cute gifts and maybe you can have your hashtag on top of your hamper, you can also make a complete scrapbook of how you guys met and how far you’ve come, you can also gift some clothes or maybe a wallet depends on your budget
So you can give these handmade photo books and boxes, Spotify photo frame, customised shots or champagne glasses, personalised caricatures, jar of quotes, grooming hampers, self care hampers