I was waiting for a New Year's resolution type post to pop up on the forum but I suppose someone has to do it first! So here goes...
For me it will be to improve on my PB times:
Sub 25 min 5k, sub 56 min 10k, sub 2 hr HM and Sub 04:30 marathon.
Try to run some more exotic city HMs and marathons.
Maybe attempt an ultra (subject to fitness progress during the season).
Run the Camino de Santiago (Camino Frances - 850 km trail in northern Spain) Run a HM and walk 10k every day for a month. (Big but -> subject to work commitments).
Try to post regularly on all the forums - c25k, b210k and the marathon forums to give feedback and support. Post to Strava and support other runners there.
Try to run Parkrun most available Saturdays and to volunteer to marshal also.
Buy no new gear in 2019 apart from shoes as required/when worn out. This one only lasted 3 weeks last year!