In terms of pickups, try checking some from Fender itself. Tex mex, custom shop, noiseless, etc. are good ones. SD's and Dimarzio are nice too.
Pero bro, not sure kung pickup replacement talaga solution don. Minsan sa amps & its settings or even pickup height adjustment lang, pwede na.
If you want to change pickups, check youtube, there are a lot of reviews there for specific pickup models. It should help.