Don't send it Either he is busy or he doesn't want to talk to you. Neither case is suitable for re-sending.
Maybe he didn't see it, or he hasn't figured out how to reply to you after seeing it. Anyway, I think it's not good to send it again, which makes you impatient. Wait a minute. If you haven't answered for a while, you can call directly. Unfamiliarity can deepen your impression.
There is also that leaders may not like to use WeChat. Generally, older leaders don't like to use WeChat, so I suggest you call or send text messages.