[HELP] with 45 $ 1 month package

with 45 $ 1 month package I have 1,000,000 website visits. So if the visit goes beyond the threshold, will my website stop working?

Your website will still work, but you’ll be contacted by the staff to upgrade the plan, if needed.
It’s not a strict limit.

for example, if I have 1.5 million hits, if I don’t upgrade the package, is it still working properly?

The staff will tell you about this when it happens. Rest assured that your site won’t be shutted down arbitrarily.