My favourite question! What you can do now kind of depends on what total and pic time you have.
Try to anticipate what you might be short of one day. Probably night and instrument. I would definitely recommend getting your FAA IR - it'll bring your EASA IR training minimums down to 15 hours.
Get your 300 miler done. An hour in the circuit is fun, but an hour under the hood at night going cross country ticks a lot more boxes. You never know where this industry will take you (I went from an R22 to a 757) - you might find you need an FAA certificate one day. Guess what? you'll have to do your 300 miler again if it didn't have a 250nm leg. I'd love to go to Florida on holiday and rent a float plane, but you can't unless you have 25 hours on floats. I could have got 25 hours on floats during my hour building for just the difference in price. Now It'll cost me another 25 hours.
If you hour build in the UK (some people do!) Try to find out popular CPL navigation routes, and make sure you know the area like the back of your hand!