Liquidity on polygon dried up suddenly?

I setup a smart contract to rotate in and out of frax when it moves above and below peg, on polygon

last night it rotated into frax and then woke up to find the liquidity on polygon had dropped to $500 on curve, which basically makes it impossible to rotate out of frax even if the price would go above peg

0x is reporting no other significant liquidity sources on polygon against any other stable that i checked, so slippage is about 50% on even tiny trades

is this expected/normal? if not, is there a process to attract more liquidity for supported chains like polygon?