I think you have a distinctive looking hand, and that's pretty good. If I were to pick one thing that is throwing off your writing, it would be the lower-case letters failing to adhere to the proportions and shapes of the letter forms. Your letters aren't consisten in spacing, proportion, and shape. When you write very "flat" like you are, it's very important that you retain the relative proportions of the letterforms in doing so, otherwise, you will lose the ability to recognize the individual letters. Imagine that you want to flatten out your letters as you do above; to do this while preserving the proportions, each letters must be "flattened" the same amount and the same way, meaning that you must scale each letter by the same amount in the x and y coordinates. There can be some minor adjustments afterwards, but the general rule applies. You also need to make sure that you can do so while retaining the important "signal points" of each letter which distinguishes one letter from another. The big ones I see right away in your writing are the r, s, n, m, u, and e. All of these letters start to look alike in your writing because you don't maintain the r's shape, the hook in the s, the curves in the n, m, and u, or the inner spacing in the e. This means that they all start to look the same when put next to one another.
Some ways that I might adjust those would be to increase the x-height a little bit and write your letters a little taller. That will change the look of them a little bit, but it will make them more legible, especially with the width of the nib that you are using (and being a big fan of wet and wide nibs, I wouldn't ever suggest just using a finer nib!). For the r, which will be hard to get right unless you really practice at it at that size, I might switch to the "Palmer r" which was popular back in the day. Read one of the Palmer manuals on business writing or look at the terminating r form from Michael Sull's alphabet. Look at the second variation of lowercase r in the following image:
After that, I'd make sure that you are keeping the space on the e, and working on the shapes of the m, n, and u.
Another thing that can help if you don't want to keep your letters taller and more narrow is creating more space between each letter. When you write as flat as you are doing right now, legibility can be greatly improved by making the letters compact and then introducing wider than expected spacing between the letters.
Here's an example of a taller and more narrow style:
And here is an example of putting a little more space and having things a little flatter, but notice how the letters are still a little taller than yours:
Michael Sull has a great variation which is a happy medium between these:
At the full opposite end of the spectrum, you might have this, which is Smithhand:
However, notice that in all of these examples,the shapes of each letter are fully distinct and proportionally consistent relative to each letter form.