You have two things going for you.
1
You have a fairly consistent slant.
2
Your brutal honesty.
I agree, you are in need of an entire overhaul. My post on another thread relates to your situation. It will seem boring and tedious at the very beginning.
Something that is a little bit hard to explain on paper - but is something you need to cultivate - is rhythm.
So, your first step would be to practice just a few letters (in the same family) and make the letters precise and build up a rhythm.
There is so much variety in the size of your letters. Some are wide open, others are pinched.
And there is too much space between the words.
So - try writing some lines of random words and gibberish words) as though they are a sentence - use only these letters.
- i - t - n - m - u and l and h without a loop just a taller straight stroke
it mint lint hint tin tun tum hum hull mull
fill up one line
and when you get to the end and start a new line, write the same set of words on the next line
start slow and see if you can settle in on some consistent shapes.
eventually, you can choose a particular style, but for now, try to find a shape that is natural and one that you can repeat consistently.
If possible, work on lined paper where the lines are the same as your x-height, so that you can be precise in hitting both the top and bottom line
I look forward to seeing your first page and hearing what it felt like and what you think of the looks of it.