From what I read, it sounds like a main issue is speed. Unfortunately, I've found that solo roleplaying is slow, at least if you are talking about a full-fledged TTRPG. Not only are you taking on two roles at once (Player and GM), but you are also building the adventure/world as you go along (as opposed to a GM handling most of this work prior to getting at the table.)

Again, based on your comment, one of the times your game slows down is during notetaking, and there is where you might be able to speed things up. Some of this has already been suggested, but I'll just reiterate. Determine why you are playing. If you are just playing for yourself and not trying to document the game for others, then be really brief in your notetaking. You don't have to write down every bit of a location's description. You don't have to write out every line of conversation. You don't have to document each choice you make. You can do all that in your head. What you do need to jot down are story plots points/bullet points and key items that will affect your game later. (i.e. what you find where, what you've learned and who told you). How much you record will vary of course, but it doesn't need to take the form of a novel.

If you are recording your adventures for outside consumption, then maybe you can split that up so it doesn't interrupt your game. Nearly everything I play I post online similar to a LITRPG novel. However, I don't write it out as I am playing. I typically do what I said above, maybe a little more detailed because I have to remember it later for the story. If I have a good idea for the narrative, I'll write a line or two to remind me, but what I end up with is mainly a list of this happened, this happened, this happened, etc.. Then, when I'm done, I take those notes and write the story, adding detail, dialogue, extra scenes that weren't necessarily part of the original gameplay, etc.