During typical interglacial periods, sea levels peak at more than twenty feet above current levels when CO2 levels remain at typical levels. This would've already occurred for us if it hadn’t been for a northern hemisphere comet strike inducing the Younger Dryas climatic event from 12,900 to 11,700 calendar years ago suppressing long term natural temperature increases (caused by CO2 levels following Milankovitch cycles).
However, what we need to consider in regards to this interglacial period is the fact that we are artificially increasing our biosphere’s CO2 levels [unnaturally, temperature now follows greenhouse gas levels] to the point that they are countering any benefit that the Dryas mini-ice age event gave us.
Note: Global sea level was 120 meters lower at the peak of the last ice age 26,500 years ago.
World Maps During Last Ice Age
(when sea levels were lower):
Future Sea Levels (how much higher is anyone's guess):
Why Sea Levels Will Rise Higher Than Ever Before: