Good sleep is important for memory
Being hypothyroid can impair memory
In addition, the following supplements may help, depending on your individual biochemistry:
Pregnenolone
Progesterone
Hydergine
Oxiracetam
Piracetam
Aniracetam
Noopept
ALCAR
Bacopa
CDP-Choline
Phosphatidylserine
L-Theanine