About the facebook groups I would recommend them as well but be sure that, before you join any of those groupes that they are a no Sub 4 sub group because any link of yout videos to sub4sub groups can hurt your channel
I know it must be overwhelming, but remember that, if you reached that incredible milestone it's because you deserve it! And there's no reason why you can't reach the next milestones
Hey! Another anouncement of a small milestone that means a lot to us nonetheless. We have now 30 subscribers to our channel and a part of it is because of you all so thank you!