@ OP, there are many good suggestions here for how to get a better vape out of your Kayfun. However I feel like I should say this just to put it out there: Not everyone likes the Kayfun. It's not for everyone.
I'm not saying this because it's just too difficult for some people. I think anyone interested in RBAs & spending the time learning to build good coils, etc., can have success with it. But for some it's too much hassle & if that ends up being you it's no biggie. It doesn't necessarily mean you aren't skilled enough to use it.
I've used the Kayfun for a couple months now & really I don't care for it. it works fine when it works, but more often than not I had issues with my wicking & that's just annoying having to pour out your juice each time something's not working right so you can figure out what it is & adjust. I just don't have any interest in that kind of nonsense so I moved on to something else. So don't worry about it if it ends up not being something you like.