SOPP259: I now want to take my piano playing to a concert pianist level

This question was sent by Krampah and he writes: Thanks so much Vidas, for your advice piano playing, I can accompany hymns and quite a number of anthems for my church, I now want to take my piano playing to a concert pianist level, I have played through a couple pianoforte tutors, will I be in a rush if I am to take Handel Messiah's pieces and play through them, or I should work more with the beginner pianoforte tutors to sharpen my sight reading before?.... Thanks in advance for any considerations.... ​Best Regards Krampah