Alpha-GPC and lion's mane are both solid nootropics, assuming they're properly dosed and the lion's mane is quality. So I wouldn't say it's placebo if you're using them properly. That said, you can add some more things to optimize your stack and get the most benefits out of your nootropic stack.
Some people have mentioned Adrafinil, which can be useful for wakefulness (I prefer other -finils, but that's a different discussion), but it's arguable that it's more of a wakefulness promoting drug than a nootropic, and I personally wouldn't take any -finil daily.
As for nootropics that you can use more often and/or daily:
-A racetam (piracetam or aniracetam) or Noopept goes well with a choline source (like Alpha-GPC or Choline).
-An AChE-I (like huperzine, galantamine, or sage) also goes well with choline and racetams
My daily nootropic is NootropiMax. It contains a full/effective dose of CDP-Choline (which, along with Alpha-GPC, is a premium choline source), huperzine-A (which also increases acetylcholine, just in a different way than a choline source), and Noopept, as well as bacopa (which can improve memory when taken daily for a few weeks, and may also help reduce anxiety), and sceletium (which can also improve mood and reduce stress/anxiety). Not to mention it also contains caffeine and several synergistic ingredients that help bring out the benefits of caffeine while minimizing any negatives. The theanine promotes a calm focused energy, the ornithine helps potentiate the duration of caffeine's effects, and the Theacrine provides additional energy that isn't subject to the same tolerance as caffeine, and is itself potentiated by being taken with caffeine.
I just took some now.