You need to seriously start considering starting a herd. You're young, full of life, and strong.
I'm sure you'll find plenty of mare's willing to join your herd.
Why not start with sweetie bell and her little friends?
They could use the experince.
Or maybe rainbow dash, the poor things been alone for years, she could use the stability of a nice strong man, and I'm sure she wouldn't mind being sister wives with sweetie and her friends.
Between you and me, she's got a tiny bit of inferiority complex. She won't feel as challenged by a bunch of fillies.
If nothing else these are good starting points.