What can I do to improve?

[Slaying_ice]

The league I am in is a 12 team league Head to head

This is my team:

C- Martinez
1b- Fielder
2b. Uggla
3b. Lowell
SS. Aybar
OF- Nady
OF- Cameron
OF- Ellsbury
UTIL- Connor Jackson
BN- Chris B. Young
BN- Melky Cabrera
BN- Crede

SP- Beckett
SP- Wang
RP- Betancourt
RP- Valverde
P- Scherzer
P- Dempster
P- Oliver Perez
BN- Cliff Lee
DL- Borowski

What can I do to improve? I keep finding myself each week not getting enough RBIs. I got players such as Ryan Church, Werth, and Rowand in the FA... Here is the link to the other players available in my league http://baseball.fantasysports.yahoo.com ... 08&sort=AR