Milankovitch cycles are long-term, cyclical changes in Earth’s orbit around the sun and axial tilt that alter the amount of solar energy reaching the planet, influencing long-term climate patterns like ice ages, named after Serbian scientist Milutin Milanković. The three main cycles are: Eccentricity (shape of orbit, ~100,000 yrs), Obliquity/Axial Tilt (angle of tilt, ~41,000 yrs), and Precession (wobble of Earth’s axis, ~26,000 yrs). These natural variations in solar radiation distribution are key drivers of Earth’s glacial and interglacial periods.
Some 11,000 years after the last glacial period, the combination of orbital parameters changed a lot. Eccentricity is near its lowest, making the total solar radiation on Earth at perihelion and aphelion closer than ever. Obliquity is midway between the maximum and the minimum, shielding a significant area of the polar regions from incoming summer sunlight. And precession is now pointing at the Polaris, the exact opposite of Vega. This combination allows the northern hemisphere to experience its summer solstice at the aphelion, and winter solstice at the perihelion, which significantly curtails the amount solar radiation in the northern hemisphere. The northern high latitudes now are shielded more from solar radiation between the spring and fall equinoxes. These new changes seem to make Earth go in the direction of another glacial period, because snow melting seems to be slowing in the northern high latitudes and snow accumulation quickening.
But one other key Milankovitch condition needed to make snowfall linger, orbital eccentricity, argues against a new glacial epoch starting now. The low (and decreasing) eccentricity makes the current dip in summertime insolation at high northern latitudes too small of a dip to trigger the onset of an glacial epoch. Look at the graph you posted in your question. Glacial epochs start when summertime insolation at high northern latitudes drops to very low values. The current local minimum is not low enough to enable widespread accumulation of snow and ice over the summer.