My son and I did the last 300km in early August 2017. On the whole no problems and only once did we have to walk on. There are many more albergues than a few years ago, but you may have to stay at a pension or local small hotel at times (not a bad idea to get a decent shower and bed now and again). If you are solo you should be OK the vast majority of nights. My advice would be to gauge the number of pilgrims you are meeting with as you walk along and what others are saying, and book ahead if you feel a problem might be in the works. Check the Gronze website (Google Gronze + camino) and click the link to the Norte. It is a Spanish website but the list of all accommodations along each stage is easy to understand; cost per night and number of beds in the albergues are provided, so the latter can give you a sense of whether there might be a problem for you on any given day. The unknown for any pilgrim is the arrival of significant groups of people at one of the smaller centres but you can't really plan for that. Good luck.