Most pens need only minimal maintenance to stay “healthy.” They need a place where they are not likely to be jostled or dropped, preferably away from sunlight.
If not used for some time, flush the ink out of fillable pens, using tepid clear water. Flush until the water is clear. If there is ink in the pen, it tends to dry and can discolor the barrel, or crack the sac, or both.
Unless you are an expert, do not try to align or adjust the nib. If you really want to try, consult a pen repair book, such as “Da Book” by Frank Dubiel or the repair book by Jim Marshall.