Hi,
Unfortunately, I don't know of a method to sort from within one long text field. To insert a new bullet at the top, you can use ctrl+home and then enter to give you a bullet at the top of the field. Another option is to use a multi-select field, but there isn't a quick way to do this. You would have to convert 100 bullets to 100 options but in the end it won't turn out as "pretty" as a bulleted list, although it would be able to be sorted.
If you'd like to schedule some time with me to discuss this or have other questions, here's a link to my Calendly: https://calendly.com/bruce_consulting/30min
I've put something together here for you within a script extension that I think does what you're looking for
Do me a favour and make a backup of your data before using it on your production base heh

Many thanks Adam!! Works just fine, time Saving indeed!
Many thanks Adam!! Works just fine, time Saving indeed!
Hah that's the goal! Glad I could help!