How do I make a certain area only accessible to me?

Solution 1:

Is "SnowyPanda" your type? No, your type is "player". "SnowyPanda" is your name, so the command you want is:

/tp @e[distance=..20,name=!"SnowyPanda"] -414 71 599

Also make sure to not include spaces in the selector, it can break the command.

Since you only want to teleport players, you can also use @a instead of @e:

/tp @a[distance=..20,name=!"SnowyPanda"] -414 71 599