I don't think it's particularly important that you go solo as soon as possible in your training. Yes, it is a milestone in your flying career, of course, but there's no need to rush it. Trust your instructor's judgment.
I was dreading my instructor getting out and saying I could go solo. The first time he did it I told him I wanted to do another hour of circuits. It was the end of a day in which I had done 2 hours of flying. I was tired. I was also fixated with flying a perfect circuit and approach, followed by a 'greaser' of a touch down. I knew I couldn't do that, but what I didn't realise is that it wasn't important at this stage. Safety was paramount. I was safe, but I wasn't confident.
I exercised my fledgling 'airmanship' and said no, but went solo the next day on 17 hours.