is there a way to get your stuff back after it despawn?

so basically i wanted to go afk so when i get back my mob spawner would be full so i went to the mall with my dad but i went afk outside my house in minecraft that was my mistake so i found out that i got killed by a zombie after i got back from the mall i pressed respawn but at the respawn menu i saw my stuff but when i respawn its gone and it despawn i took me over a month to get those things and theyre just gone so i just need a soultion is there a way to get my stuff back after it despawn and if youre reading this i hope you can find a solution ill be eternaly gratefull thank you

 

-Ravi