I would try removing await, await creates a new promise that your code isn't fulfilling so it just stops and doesn't respond back, also you might want to try using

(im new to await so I might have explained that wrong)
"interaction.deferReply();" in the future this give your bot up to 15 minutes to respond

i hope i helped!

id try removing await and just use:

 interaction.reply('Pong!');