A bad mosquito problem almost always means they are breeding somewhere nearby, most likely in rainwater accumulated in human trash of some sort. On a small lot the problem is exacerbated by the likelihood that this is likely on some neighbor's property rather than yours. Until the breeding sites are found and dealt with one way or another you will always have some no matter what you do to repel the adults. I have been around them so bad that I made a smudge pot and kept something smoldering in it while I gardened, standing in a cloud of smoke the while.
So walk your
land, and the neighborhood, and try to spot the breeding sites. Cans, containers, tires, large pieces of plastic pooling rainwater, etc. are prime possibilities. Empty these and clean them up if possible. Also stagnant
water that is ephemeral (that is, which dries up in drought and doesn't stay there year round)----this breeds mosquitoes, whereas permanent water with a full aquatic ecosystem in place usually breeds more mosquito predators than mosquitoes. If you suspect something like a ditch,
pond, abandoned swimming pool, or some such that is holding water for months, you might contrive, whether with permission or not, to introduce mosquito fish or other mosquito predators into that site.
Sometimes breeding sites are hidden. I tracked one bad problem to a badly leveled gutter directly overhead with rainwater puddled in the blind end. They can also breed in knotholes in old
trees, high overhead and out of sight, but stump holes near the ground are more likely (sweetgum is bad this way in the South, because the outer layer of the stump stays alive while the center rots out)