Be patient, give it more time.    Lack of vividness points to lack of general attention to life experiences (both waking and dreaming).  Try spending less time "zoned out" on videos, games, or other activities where you "lose yourself," and instead pay attention closely to the present moment.    You can only remember experiences vividly if you pay close attention to them while they're happening.    Today people are "zoned out" ("on autopilot") a big majority of the time.  Pay attention to your experiences, reflect up on them (particularly, "is this dream-like?"  "How odd is this?"), and practice recalling them (recall your day before bed, and your night [dreams] in the morning).   Keep doing this and vividness of both waking and dreaming experiences will eventually skyrocket.