Many say that this season was problem and solving. Now that is 80% true but there was a difference this time with the problem solving playing a bigger role. Take for example Wells being back, a little bit of Zoom experience. The whole part of captain cold was stupid with just an appearance and then being gone. The Hawkgirl seems to be kind of stupid as well since she is most likely going to disappear. And the gorilla part as well.
To conclude they need to try to come up with a story that can continue in the long run rather than having one episode storylines. Predictability also makes it boring.