Use to fish El D about 3 times a week, a few years ago, I went about 4 months ago, and was let down due to the cattails being over grown on the ranger lake, you can't even fish the east side of it now, and the west side has limited spots compared to a few years ago.
Anyway, yes, very hard to catch bass there now, unlike it was back then, although the fishing was tough, we figured out ways to catch em. The bass you see in my avatar was caught on the east side of the ranger lake, about 8' off the shore line.
When I went the last time, I got skunked.
Keep in mind all the city park ponds/lakes have Major pressure, so what you might want to try is rig up a split shot, with a 4" roboworm, I had good luck with the Hologram Shad and cast it out almost parallel to the shore line, no matter which lake your fishing, I think that's gonna be your best bet.
I've fished Every city park in so. cali even the ones in the O.C. they are all tough.
The only way to get better at it is to fish more, i.e. time on the water. By the way, I never went on weekends. Good luck, and welcome to B.R.