Entirely up to you, that one.
Some of us like messing around with engines, bolt-ons, go-faster bits, tuning etc, and some just want to ride 'em.
If all you want is quicker, then have a look in a couple of mags and choose the flavour of the month, but be prepared to keep chasing the dream when the latest, quicker one comes out.
But you can do quite a bit to improve the standard bike and make it more reliable, just have a look around on this site for other people's experiences.
Factors:
Funds available
Wife's permission
How you ride
Track days? street? commuter? Cafe posing?
Mechanical expertise/level of confidence/tools available
Whether it's a keeper or you like to swap around
What colour it is

It's not falling off, it's an upgrade opportunity.