I got a reply from Bishop Williamson!
I do not want to post what he said in full, as His Excellency didn't give me explicit permission to make his words public. However, in response to what I should do in regards to my vocation to the priesthood and how I should go about pursuing it, he told me to:
1. Pray 15 mysteries a day of the Holy Rosary
2. To not be tempted by sweet girls, or to get too close to them
3. To pursue a worldly career, but not one which would force me to occur massive amounts of student debt
4. To live like a hermit "until God gives us back some decent seminary."
He also said, "Console yourself that that might not be too far into the future."
I would like to thank Maria Elizabeth for suggesting that I should write to Bishop Williamson in the first place, as I feel much better about my vocation now. His reply gave me hope, and it was nice to know that even though His Excellency is currently undergoing many trials at the moment, he can still find the time to respond to someone as unimportant as me, and to give me advice on my vocation.