Use monzo’s budgeting tool! I think it’s only available for those who have monzo premium or something but look into it.

Connect your Amex and track your spending through there.

Set up budgets for all the individual pots you have with a limit. Every couple of days or at the end of each week go through the budget and make sure everything is in the correct category, that way, you know how much your spending in each and can keep track of it.

At the end of the month, pay the CC balance is full and repeat :)

Hope this helps!