OK, I’ll try to be a bit more constructive… I used to boulder up to V9 until I moved to a city and stopp climbing, so should be able to help a bit.
Try to climb slowly, and flow between moves – so reduce how much you jerk with your feet and hands. Place your feet deliberately, and think about your footwork, good footwork will help you push grades.
Visualise a problem before climbing it, look at the holds and the gaps between and work out how you’re going to climb between them before hopping on the problem.
Downclimb everything you find easy, this will help your lockoff strength.
Train to climb, don’t just climb. Jump on a pullup bar, and take a look at 10-minute workouts – Metolius had some details on their website for this if you google it.
If you’re serious about getting stronger, you’ll need to climb at least 3 times a week and train between.
Think ‘light’ and ‘smooth’ when you’re climbing.
If you can, do attend a training class as it will help – but the best help you can get is to train with someone – training with someone better than you will help you push your grade – but having someone at your level will make you competitve and try harder and more bolder moves.
The biggest tip is to climb outside. Real rock is a sure fire way to get stronger and to open your mind – climbing by colours is good for training, but when you go outside you’ll be overwhelmed with the choice for feet, smears and poor holds.
Grab yourself a guide and spend a week in the peak, north wales, lakes, just climbing stuff – or get yourself down to Font and be spolit for choice.
As for routes…. I can’t help you there, not my scene – I couldn’t stand the faffing around.