Your solo comes when it is ready. Please don't make any assumption that 35 launches in a glider will help - it didn't for me, and I had hundreds
There is a differnce between gliders and powered a/c - the engine! and that is what slowed me up. I couldn't get to grips with the throttle.
Just fly well and take the solo when it comes. Don't be too arrogant to accept that you may not be as good as you think you are
At the moment I am flying with experienced pilots who can't come to terms with a new type. They are flying worse than student pilots and are not safe. This is not like driving, and often you will take a step backwards before progressing, but the key thing is to be safe.