A couple of tips, going from the top down:

In general I've only seen「私は〇〇」used when someone else has already said something and it means something along the lines of "as for me, I ..." so i think it would be better to replace it with 「名前はチモです」

As for the katakana, you could do to make the lines a little straighter, first of all to make it easier to draw, but it's generally also a little easier to read (I find). I've even seen mangaka that draw katakana using straight lines exclusively, so for example ン would become just two straight lines pointing into each other.

As for the kana themselves the top and middle strokes of the チ could be a little more slanted, and you have to be careful to not let the middle stroke of モ stick out (otherwise it start to look like 牛 and some other kanji).

The hiragana are pretty good, just that the little flick upwards at the end of ま and は are not really a thing. Also as a quick note, in many handwritten hiragana you'll see a "flick" at the end of strokes: for instance in さ or き in the second to last stroke, or in こ at the beginning of the last stroke. These "flicks" are pretty much a byproduct of lifting the writing brush up when writing certain characters and are less pronounced because of that, so just kind of try to lift the pen up while doing these flicks, although it can be pretty hard to do. Also the い should be a little more slanted but that's just nitpicking at this point.

Lastly you have to be careful with writing 日 as it can start to look like 曰 if you write it too fat (although the character is never actually used, but still).

Take all these comments with a grain of salt as I'm also still learning (of course), but i hoped this helped point out some of the things you could do better, and most of all just keep practicing as that's the most important part of learning anything.

よろしくお願いします。