Not quite sure if gender is important, but I've been trying to stretch and increase my lower chest voice by consistently singing the lowest note I can (E2) until I feel I can go a semitone down. I try an Eb in a whisper, trying to increase the volume until I can hit it fully in the chest voice. A few days ago I was able to hit it consistently in chest voice around the late afternoon, and ever since I was able to sing it, save for random times I go about an hour or more without practicing, and suddenly my lower range feels... foggy? I just can't reach my lower notes, it only affects my range from an F2 down, but it strikes me at the times I'm not practicing.

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I've been trying warmups and they aren't working, can anyone relate?

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What low bass chest note warm-ups have worked for you?

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How am I able to increase my lower range more effectively?