You could do 150 hours (less time so far during PPL) doing nothing but circuits. But you'd struggle with the CPL in that case.
Agree with everything so far so I would just add ... as well as being disciplined with your checklists, get used to saying them out loud, even if you're on your own. If you're taking a passenger, practise a full brief on them.
I hope I don't have to remind you to get into the habit of fully checking NOTAMs and the Royal Flights line.
Cheers
Whirls