Crack JWT HS256 with hashcat with Intel I9

[Jojo koko]

-a3 is bruteforece yes, but you didnt specify an attackmask
try

hashcat -a3 -m16500 --session my_session --increment pass.txt ?a?a?a?a?a?a?a?a

this will start a bruteforceattack with all ascii signs start with lenght one, after that length 2, till reaching length 8

If I didn't  specify an attackmask so what will be the attack  mask? All the options not?