First:
Congratulations
there are several options:
1. split the page into different accounts. maybe member area as another account?
2. unfortunately with such a number of visits it is expensive, I suggest
CLICKY.com (I use it) - it will probably be cheaper than google analitycs.
3. the best free solution is
https://matomo.org. you would need to configure the server, preferably with loadbalance eg DigitalOcean. or VPS on NVMe disks. ask mojohost for it
4. when talking about hosting on NVM, I would suggest
clouvider.co.uk even buying a VPS + matomo will be cheaper than clicks or google analitycs.
me personally. I would go in direction 4.
hosting nvme on clouvider and matomo.