Here’s a great set of mnemonics for the hand signs for solfege syllables

DO   super strong like a fist

RE   always sliding up and down

ME   super stable so it’s flat

FA   always feels falling down

SO   also strong, like a slap

LA   a balloon floating up

TI   always pushing to the top

DO   super strong like a fist

https://www.youtube.com/watch?v=NcGFiTnA0HA