If the shoe is not too tight, and the shoes are not fixed to far in/out/forwards/backwards... then I just suggest you wriggle and flex your toes often ...

Shoes with cleats (yes, I know, cliplesss, so silly - I started a thread asking just that question!) but shoes that clip in are hard and your feet have little room to move, so you need to make the effort to keep the blood circulating

Wriggle and flex... flex and wriggle...