Beginner Gardening: Yet another "Stasis" problem, this time with a Moonvine., 2 by Kalloused

Kalloused wrote:
First my Zinnias just stopped growing out of nowhere and now my Moonvine has done the same thing. The weather has been nice and hot and the vine was doing great. Wrapped around it's pole nicely and got pretty long, then it stopped with a tiny leaf starting to come out and hasn't budged in over a week. Everything is in brand new soil and I'm having no problem with my Cosmos which are coming in great. The only thing I noticed is the Moonvine has had some aphids on it(first time I've ever seen them) and on the very tip where it has stopped growing there were a lot on there. I understand Moon Vines don't do as well in containers but I have a pretty huge container. Can I cut back the tip and see if there will be any new growth? Im going to be so depressed if everything is a total failure this year. I've been looking forward to my flowers all winter. Pictures enclosed and ANY HELP is greatly appreciated. Thank you
Kall