I have one remaining English lavender plant, out of several initially. (The others all got old and woody and could not be resurrected.) I tried replanting and the new ones promptly died, so don't feel bad! Maybe it is the winter moisture doing yours in, but more likely they just aren't winter hardy in your zone. (I looked up one cultivar, and it had a minimum zone of 8b.)
The French (? Spanish) lavender,
Lavandula stoechas does better here, and we have lots of volunteers. It too, though, is only hardy to 8b.
The Lavenders are nice for their flowers, but the foliage is imo somewhat mangy, and they all get woody and ugly as they age, and then you need to do something about that (brutally cut back and
for new growth, or remove and start over).
You might try
Campanula (blue-violet flowers, somewhat less sprawling than catmint, should be hardy in your zone).