If you get on OK with track days then you may like to consider having a go at hillclimbs and sprints in the future. There are various pros & cons between track days and actual competition so here are a few for you to consider:
Track day Pros - build up gradually, go at your own speed, no special equipment required
Track day Cons - can be hard on tyres & brakes, can get involved with other driver's mishaps, expensive
Competition Pros - hugely satisfying as you build up your skills levels, can quantify improvement year on year & event by event against others, great camaraderie, only essential requirement is to mark on/off on ignition switch, cheaper (typically £100 to £150 per day), any accident can only be your fault!
Competition Cons - initial outlay for for minimum requirements (licence, helmet, overalls and gloves) c £500, only 5 to 10 minutes actual driving time per event (but this will be guaranteed to give more of an Adrenalin buzz than an hour going round and round on a track day).
I don't know where you are in the UK but if you are within reach of the Midlands then have a look at these two web sites for more details:
http://www.speedchampionship.org.uk/latest-news/2020-provisional-regulations/ or
http://www.cmscc.co.uk/
Enjoy whatever you decide to do!
Steve