Guys,
I recently moved from my hometown, which sits at 960 meters above the sea level to another city which is at 2640 m.a.s.l.

I've noticed my lack of air specially when climbing to a local mountain with a peak altitude of 3100 m.a.s.l. Is there a way to regain fitness/adapt to the new altitude? I've been riding for a couple of months but I am nowhere near my fitness level I enjoyed when I lived in my hometown.

Thanks in advance!