I caught some fish, and I can catch more, but my backpack space is not allowed. How should I dispose of these fish, in other words, where should I sell it?

GENERAL INFORMATION What is your Minecraft Username?: Hi_Joe2005 Past warns/kicks/bans?: I didn't get any warns/kicks/bans. What is your timezone?: Pacific Daylight Time Do you have Discord (if so, what is your Discord tag)?: Yes, Hi_Joe2005#6615 Link(s) to all past and present applications...

IGN (Minecraft Username): Hi_Joe2005 WHAT YOU NEED (ROLE/RANK): Age 17, grade 11 YOUR CURRENTLY ROLE/RANK (IF ANY): Age 16, grade 10 EVIDENCE: When I come to grade 10, no matter how long I wait and I stay in grade 10, I won’t be upgraded after the countdown. Every time I log in, the countdown...

How?