Just leave it be for a few weeks... The airlock not moving, or being long enough between movements, is no indication that things are not still happening in the wort. Just means that the yeast isn't producing as much excess CO2 that needs to be vented out of the fermenter.
After a few more weeks, take a hydrometer sample, get the SG, and then taste the sample... Repeat 2-3 days later... IF it tastes great/ready then bottle/keg it up... If not, leave it be for another week or so, and test/taste again...
Also, is the wort still within the happy temperature range of the yeast?? If the temps dipped lower, they could just be taking a nap... Get them into a slightly warmer room and see how things go... Just move it gently.