Ashton can take inspiration from Steve Smith and Lance Klusener,Smith was originally touted as playing for Australia for his leggies,thankfully either he himself or somebody else told him that his leggies were dreadful and he started concentrating more on his batting and it proved a winner,Klusener was an opening bowler who batted at number 11 who completely trasnformed himself into a devastating batsmen in both ODI's and Test Cricket(Especially in ODI's)
Agar has no future with the ball,take inspiration from these two my son because you do have batting talent and at 21 years old there is plenty of time,your bowling on the other hand needs the glue factory.