I can't use trade function during 15days due to steam guard.
In this situation , Is there any way to send my gift to my bot ?
Or do i need to wait just 15days ?

Thanks

Theoretically there is no other way. If you send the Steam game as gifts to the bots, there won't be an option to add them to inventory so the bot cannot accept them. Although some people have reported that certain gifts could still be sent using this method, I have no idea which would or would not work.

We can only accept tradable gifts that are sent with a trade offer.