There are a few common values of fairies which will allow you to match their frequency more so they may make themselves known. First of all, fairies are nature spirits who manage each plant and animal around you. The nature elementals, a type of fae, were described by Paracelcus and include salamanders (fire), sylphs (air), undines (water), gnomes (earth) and devas (spirit). Secondly, they bear a childish spirit of joy and innocence which can be forgotten by adults due to stress, trauma and responsibility. Combining this into an innocent joy for nature is the most advisable way to get more in touch with them. It may also be a good idea to find a map of the ley lines, the crisscrossing grid of energy laid across Gaia, and travel to a line or nexus as supernatural occurences are far more frequent around these areas.
The color green which is so important to them is bore by most plants and symbolizes love and is the same color as the heart chakra, as well as all the associations with one of the most powerful deities on Gaia, Inanna. Inanna is also known as Ishtar, Astarte, Aphrodite and Venus and takes on the qualities of the luxury and bounty of the Divine Mother. Gaia herself has a very similar energy, bearing a motherly personality of extreme generosity. Being heavily influenced by the Earth element, fairies may seem very caught up in aesthetics and sensible beauty. It would be best to understand that aesthetic sense is a way to detect energy manifested as Earth.
Notable historic figures and legends regarding fairies center around Thomas the Rhymer and Robert Kirk, and the Cottlingley fairies event which caught the attention of Arthur Conan Doyle. However, they are still being contacted today; find a local druid or shaman, or even children, and they may have stories to recount to you themselves!
Fairies have especially interacted with humans in the Middle Ages. Nowadays it tends to be more discreet but it should swing back to more frequent sightings and even full societal integration. Many fairies follow certain human bloodlines around. This includes immigrating with them; certain ethnicities may have certain fairy folk around them which followed them from their ancestral lands.
There are plenty of fae incarnate here as humans, myself being one of them! Their blood is mixed frequently with certain ethnicities, and it is very powerful. For me the blood "activated", and I gained powers and started to become more fae-like in my appearance and behavior. Some traits they tend to bear in common are a primal attachment and devotion to nature, interest in the esoteric earth magic of herbs and crystals, bold expressive eyes and youthful qualities. Merpeople, a race of water fae, commonly incarnate as humans and are allies with the land fae. They are known for their extreme empathy. Merpeople are making their presence increasingly known and even have their own conventions. If you think you are fae-kin I would be eager for you to e-mail me.