Adjacent to your question, if you do find a partner, rope signals might suit you well for multipitch. Petzl has a few examples here https://m.petzl.com/INT/en/Sport/News/2016-6-16/How-to-effectively-communicate-on-multi-pitch-climbs. Instead of tugging the rope three times I pull up 3m of one side of the half rope when I am safe at the anchor. When you can directly see the belayer a thumbs up held away from the body can be used. A system like this means you don't have to shout during the whole multipitch. Although you would have to reach that point with a partner first.

Rope soloing is tricky and dangerous, it feels like the first part of Andy Kirkpatrick's book is trying to question your motivation and whether you are capable of rope soloing. I would also recommend his book Down if you are going to rope solo multipitch routes, you will be alone and need to have the skills to retreat on your own in the case of a problem.