Im pretty new here but the second one is really good, the first is tricky because double letters are generally pretty hard to do so maybe even get rid of the second L, also this doesn't really matter but the T and the I could be a little wider to match the S and the L
Good start Doge - I would go back to basics. All the way back to when you were a kid and were first learning how to write your ABC's. AND Im not saying that to insult you or be a jerk but, like with all art understanding the fundamentals and practicing to perfect those teachings are key. Having that said letters need structure and strong bones. Once those bones are constructed properly there is a simple trick any person can apply and create a "font"/ graffiti letters by just duplicating your bones and connecting them on the ends. I would start that exercise with keeping the widths the same thickness for now. Once you've gotten that mastered you can begin to manipulate your fonts.
Thing I did was pretty much the same but leave no speace between the letters, also make them blocky so there's no more free space. Then pick lines and make the curvy, with a pointy end, angle them, just do stuff to the letters and you'll get the hang of it more and more. That's for starting tho, just work on it and then you'll get better, also repeat repeat repeat, that's what's graff about.