Does anyone know anything about gardening?

I need some bush / shrub ideas, as I'm becoming underwhelmed by one of our borders.

At the moment, there is (moving away from the house)

• a nice big Acer japonicum/*
  
• a scrubby hardy fuchsia/*
  
• some weird unidentified thing
  
• an arsehole clematis
  
• peonies/*
  
• a scrubby pieris japonica
  
• a good size camellia/*
  
• big agapanthus/*
  
• another scrubby pieris japonica
  
• more peonies/*
  
• a rose that just won't die
  
• something rhubarby
  
  

The starred ones I'd like to keep - the rest, I'm not so fussed.

The clematis would be ok, if it didn't grow so rampantly & strangle everything in its path.

I'd quite like some evergreens, like the camellia, do give some all year foliage.

It's a North facing border, with reasonably well draining loamy soil.

Any suggestions what else I could try?