Sorry we get off topic. One thing leads to another and... Staying precisely on topic is not something we are good at.
To make a better wine, one has to decide just what "a better wine" really is.
We have already discussed the fact that what one person enjoys in a wine is not always agreed upon by everyone.
Do you want to make the wine that tastes best to you and you don't give a hoot what anyone else thinks?
Do you want to make a wine that lots of other folks like, even if you don't like that wine yourself?
Do you want to try and win a prize/ribbon for your wine at a contest?
All these are considerations.
Do you want a white wine, a red, or a rose?
A sweet wine or a dry one?
How long do you want to age the wine before you drink or show it? Whites and roses generally are ready sooner.
One way to potentially improve your wine is to select a yeast strain that brings out the qualities you are looking for in a wine. Here is a yeast chart I have used for a long time. See if there is anything in it in which you might be interested.
http://www.morewinemaking.com/public/pdf/wyeastpair.pdf
Next, you have to make sure the wine turns out its best by not doing anything that might cause volatile acid, oxidation, or anything else that might ruin your wine. So, you need to understand and practice good wine making methods. Best way to learn is to read, ask questions, read more, and make some wine.
The little "tricks" are probably what you are after. There are things you can do to improve your wine, most of them are in baby steps; one step may not make a huge difference but several of them together just may make a big difference. As mentioned, yeast selection is one of them. Learning these, again, takes reading, time, and experience.
Have realistic expectations. A kit wine is never going to revile a Penfold Grange, no matter how hard you try. A wine from an ultra premium kit will typically make a better end result than an inexpensive $50 kit will. (I'll probably hear it for saying that!!!) Though it can be done, don't expect a wine from kit to revile the same variety of wine from fresh grapes. Along the same lines, it is not likely you will have access to the quality of fresh grapes in order to make something as good as a Penfold Grange. They just don't sell them and there is nothing you can do to duplicate them.
This could go on for many more pages. First, answer some of the questions from above; that's a start. Just understand that the end results is generally limited by many things, like quality of grapes, equipment available, sanitation practices, and experience.
You need to educate your palate, so you really do know when you have just tasted a very nice wine. I can't give you all the types of fruit I taste and smell in a wine, but I sure can tell you when I have tasted a wine I really like.
One thing I do to help educate my palate is to go to as many wine tastings as I possibly can. This way you can taste 4 or 5 nice bottles of wine without having to purchase them.
I don't know if this helps you. So, start asking questions. Someone on here should be able to answer them.