thank you!

For coding, I used leetcode. Get a monthly membership for a few months, it's well worth the $30 or whatever it is these days. And just do 3 coding questions every day until you don't feel rusty anymore :)

For systems design, I like these two youtube channels a lot: (1) https://www.youtube.com/channel/UC-vYrOAmtrx9sBzJAf3x_xw and (2) https://www.youtube.com/channel/UC9vLsnF6QPYuH51njmIooCQ

Best of luck!