"I need to slow down and not rush everything as much." ... ... Or maybe 119 m.p.h. Prospects become major league regulars  and regulars become legends  usually over the course of months and years, not days or weeks.
Thorough training over the course of months and years will turn him into a formidable contender.
( z0 turn :ARG0 ( z1 train :ARG1-of 13 :ARG2 ( z2 he ) :duration ( z3 and :op ( z4 multiple :op ( z5 temporal-quantity :quant 1 :unit ( z6 month ) ) ) :op ( z7 multiple :op ( z8 temporal-quantity :quant 1 :unit ( z9 year ) ) ) ) ) :ARG1 z2 :ARG3 ( z10 contend :ARG0 z2 :mod ( z11 formidable ) ) )
(z0 / turn-02
    :ARG0 (z1 / train-01
              :ARG1-of 13
              :ARG2 (z2 / he)
              :duration (z3 / and
                            :op1 (z4 / multiple
                                     :op1 (z5 / temporal-quantity
                                              :quant 1
                                              :unit (z6 / month)))
                            :op2 (z7 / multiple
                                     :op1 (z8 / temporal-quantity
                                              :quant 1
                                              :unit (z9 / year)))))
    :ARG1 z2
    :ARG3 (z10 / contend-01
               :ARG0 z2
               :mod (z11 / formidable)))
Thorough training over the course of months and years will turn him into a formidable contender .
z1 :ARG1-of 2
z4 :op1 z5
z5 :unit z6
z5 :quant 0
z3 :op1 z4
z1 :duration z3
z3 :op2 z7
z7 :op1 z8
z8 :unit z9
z8 :quant 1
z0 :ARG0 z1
z0 :ARG1 z2
z1 :ARG2 z2
z10 :mod z11
z10 :ARG0 z2
z0 :ARG3 z10