Heh, evidently I stand corrected about DO and NodeBB. Used DO stuff early on (but not for NodeBB). They then became very popular and I saw significant increases in cpu usage without any commensurate increases in load. Boosted a couple droplets up a notch. Didn't do much. Spun up a virgin node and saw cpu loads into 2.x to low 3.x's just idling on my ssh connection. I bailed to a different provider and have not checked in with them in years. Maybe a scale/infrastructure growing too fast issue?
In any case, good that you can get it sorted for minimal costs.