Thank you bd and alphahawk for the advice.
I guess I'll try for catfish just to get some fish, and try to catch bluegill while waiting. I may go to Seven Points again once more and try really really deep for bluegills.
Funny thing. Last Sunday, my suspended bait got close to the banks, so I tried to reel it back in to cast out further, but there was something unusually heavy on my line. At first, I thought I had hooked to the rocks, but I could still reel in little by little, so I knew it was not rock. Nothing was pulling my line, so I figured there's no fish on it, or probably a fish that did not want to fight
. Finally when it appeared on surface, it was a big plastic serving tray, looked like it'd been under the water for a while - was black in color. I bet my line was not deep enough to hit the bottom of lake at Seven Points - could these things be moving under water and caught my hook? Reminds me of the 43lb buffalo that hooked it's fins when I was fishing at Seven Points with my trainer in 2010.