I quit trying to write normally a while back. Everything I write is in capital block letters, it looks like a clumsy 7 year old wrote it but it can be read.
*Take as much time as it takes
*Ignore lines & boxes, use the space you need
*Use your favorite pen
🙂🌻

My advice is simple. Forget buying special pens and try slowing down. I find that when I slow down, my letters stay level, and don’t shrink. I think it is a result of two things. 1. I’m concentrating more and 2. My hand moves smoother across the paper so I’m not squishing the letters together. It may take more time, but at least mine is legible. Hope it helps

The heavy fat weighted ones (and eating utensils) have helped me.

My writing sized changed from medium cursive in what seemed in a day. However, I discovered I can write on non-off time in very small block form. It’s tiny, but legible. It take me a while to write a complete sentence.
I practice writing every day. I can’t use a fat pen. To make these little letters, legible, I use fine tip pen and let it dry.

Hope this helps someone……..Gordon

A few years ago my husband and I attended Parkinsons symposium in San Antonio. At one of the tables that had pd information had a special pen to use. Not only was it a fat weighted pen but it had big grip on the end. I can write when I use that.
Check on Amazon for
The Pencil grip heavyweight pen with grip.