I started out with the same DIY kit you got and I've been doing kits for a couple years now, one piece of advice I can give that I reckon will definitely help is to go on the Cooper's website and buy the ROTM (recipe of the month) kit when you have time, grab that, and just follow the instructions exactly as they say. It will help you learn a few things about beer brewing and the finished product is generally pretty good compared to straight kits. They deliver so all you have to do is crack the box, follow the instructions and then after a bunch of those you'll know what you like. It'll give you experience with some of the different kits too and help you figure out what sorts of beer styles you want to brew in future.
If I had to give a few quick tips, I would say - don't expect too much from straight kit + brew enhancer brews, it's like the difference between a bottle of dolmio and some spaghetti and going to an Italian restaurant, you'll get beer with alcohol in it but it will taste like you scooped a can of goo into a plastic tub. But keep persevering they get pretty good with a few hacks. Get a brew fridge and a thermometer controller thing, and don't be scared to experiment. if it turns out shit just put ice in it or mix it with lemondade and make a shandy.
If you want a better result with absolute bare minimum of work, buy the more expensive Cooper's kits, use LDM instead of BE and brew them to about 19 litres to concentrate the flavour a bit more. My favourite kits at the moment are the Hefe wheat, it tastes good in every recipe I've tried, the dark ale, porter, Euro lager, and the Canadian blonde is a good one to use instead of BE, it's pretty low in flavour, it's basically like a better version of a box of BE.
The fridge made the most difference out of anything I did.
Happy brewing!