I belong to an online classical guitar school (classicalguitarcorner.com) and the host of the site (Simon Powis) turned things around a bit for his new year resolutions - instead of looking just to new things to do in 2018 he looked back to 2017 to see what had worked well (or not) to see what to build on in 2018. I thought this was a great idea, so I posted my own
list of guitar stuff that worked here (starting with learning to sight read better).
What guitar things went well for you in 2017? what didn't?