Sea levels have been rising since the end of the last ice-age 11000 years ago.
The rate of change has been reducing - with perturbations caused by the solar barycenter oscillation - for 11000 years.
Sea level about seven to 8 thousand years ago was about 20 to 30 feet higher than now. When the next ice age hits, which could be anytime, sea level will drop about 500 feet and sea level will be at the edge of the continental shelf like last time and the time before, and before.