I'd suggest perhaps you set yourself some tasks, then try to fulfill those tasks as accurately as possible.
For example, plan and fly a route, as efficiently as possible to - oh, Fishburn, maintaining track and timings within 2 minutes throughout, and arriving bang on schedule.
Or perhaps, on a day's flying, take a little bag of airfield names that are within 20 miles of your route, pick one at random and fly a really accurate diversion to it.
Or arrange to go and fly circuits at a couple of airfields that are very different to Stapleford. Say, Popham and Cranfield, then return - having of-course landed and paid fees, but also done everything as accurately and by the book as you can.
I'd also suggest, if club rules permit, some robust practice at PFLs and simulated engine fires, until you are really consistently picking and setting up for a good field, with all of the actions in between.
And be really merciless with your own flying standards. Possibly record the intercom/radio so that you can review your RT, simulated mayday calls, pax briefings, captain's brief...
And if you are preparing for a commercial course - do yourself a favour and do performance, W&CG, flight planning and maintain an accurate PLOG for EVERY flight. So that, when you get you your CPL course, doing all of this (plus NOTAMS, met, etc.) is all really punchy and second nature.
G