How do i get this macro to roll dice for the characters level?

@{selected|character_name|wtype}&{template:simple} {{rname=^{hit-dice-u}}} {{mod=D@{selected|hitdie_final}+[[@{selected|constitution_mod}[CON]]]}} {{r1=[[1d@{selected|hitdie_final}+[[@{selected|constitution_mod}]][CON]]]}} {{normal=1}} @{selected|charname_output} How do i make this macro roll once with the appropriate dice per character level? I am using this for a short rest script. Does anyone know how to make a macro to set a token back to it's max hit points? I need that too.

If your game uses a sheet, it's likely it tracks character level as an attribute, you could just go to the A&A tab and find the exact attribute name and you're set. What game/sheet are you playing/using? Macros can't change attributes, unless you are Pro user and also use some API in a macro.

I'm using the 5e OGL sheet.

What i want it to do is get the characters level and roll the extra hit die per level in one roll.

Go to your A&A tab on the character sheet, and search for an attribute with name that sounds like it's for the character's level, and use that. I don't know the 5E sheets on roll20 at all.