where to put your startup cash between raises?

we closed our seed round about 4 months ago and have roughly $1.8M sitting in a regular business checking account earning basically nothing. our burn is around $120k/month so we've got decent runway but it feels stupid to have that much cash just sitting there at 0.3% or whatever chase gives you.

I know there are treasury and yield products now but honestly haven't had time to research any of them. mainly need something where I can pull cash quickly for payroll and vendors without waiting days, something safe because i'm not trying to get cute with startup runway, and ideally earning better than a savings account.

what are other founders doing with their idle cash? anyone using mercury treasury or something similar? we're also operating in GBP and USD which complicates things a bit since we have a few UK-based contractors.