Assuming you do not have any other proxy in the way…
You have 2 possibilities:
a) Disable all proxying in Cloudflare, which is very simple and straight forward. You can still use their DNS, you only loose the “anonymity” (which is easily circumvented if someone is targeting you anyways).
b) Enable proxy protocol on your Apache, which is kind of complicated and potentially troublesome if you aren’t a seasoned Linux Sys Admin.
In both cases, you do not need to pay unless you want to.
If you happen to be a good SysAdmin or if you are not but feel adventurous, here are 2 good starting points:
PD: Is not really that hard or complex, but the lack of documentation does not help the first time you try to achieve it, after that it’s easy as pie…
Let me know how it goes!