anniversary presents

ok so i had no where else to ask lol, but im struggling so much, its mine and my fiancés 4 year anniversary this weekend and i have NO idea what to get him...he loves anime but he has so much of it all so im just kind of stumped on what else to get him because he doesnt really like much and most other anniversaries ive bought him things that i knew he wanted but he hasnt really mentioned anything that he wants to get lately so im stuck. Help please haha