One beautiful prayer that combines thankfulness and anticipation for new opportunities is the Serenity Prayer:

“God, grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom to know the difference. I am thankful for the blessings of today, for the lessons learned, and the moments shared. As I lay down to rest, fill my heart with gratitude for all that has been and excitement for all that is yet to come. Guide my steps towards new opportunities, open my mind to growth, and let Your light shine upon my path. Amen.”