Recreational / Hobbyist UAS pilot reported flying above 400 feet without authorization.

Narrative

Myself; was operating my drone in sea isle city New Jersey around XA00am on Day 0. I was on vacation; flying for recreational photography purposes. Before flight; I checked the 'Air Control' app to see if there were any restrictions or no fly zones. My flight area was clear and no restrictions. I visually inspected my flight zone and made sure there was no other traffic in the sky before flight. I was all clear. The flight area under my drone was clear. I then flew my drone straight up to 500m. Still clear and not interfering with any other traffic in the sky; there was nothing near me. I took a few photos remotely using my drones camera; hovered for a short time and rotated around to capture a few more photos before descending back down to under 400feet.I'm self reporting my flight deviation this evening because shortly after my flight; I posted a photo online and had a viewer question my flight altitude. After realizing that I made a mistake and flew past the allowed 400 feet; I came here to self report the flight deviation.Initially; I thought that since there was no flight restriction and the airspace was clear of all traffic; I could fly to what the software allowed for recreational purposes. But was completely mistaken.I did not have any collision; I did not encounter any other traffic in the sky; there were no close calls; no one was injured; and I never lost control or signal of my drone. I had full control during my entire flight. I just simply flew too high and returned to the proper flight altitude.