If you want to keep moving through the training, there is nothing to stop you moving on to the more 'advanced' lessons and then come back to solo circuits. You'll be back out in the training area but could always ask to do a couple of dual circuits when you return. You'll need to do an additional 3 hours solo (usually practising advanced sequences) after your 2 hours solo in the circuit, so don't do any lessons that will require re-flying down the track. Your instructor should be able to let you know which lessons are suitable, but you could think about (depending on how the school structures their syllabus) forced landings, instrument flying, crosswind circuits, precautionary search and landings, steep turns and advanced stalls. Your general flying will only improve.
Don't worry about how many hours it took to go solo. It only matters if you have a pissing contest at the bar on a Friday. You'll be anywhere between 10-15 hours by the time you're 'ready' - who cares if you get up to 25 hours doing further flying while you wait for your paperwork.