Hi @nanasflowers
We have carried out extensive testing of Wordfence on WordPress 5.5 and Wordfence is working correctly for us on our quality control test sites under different server environments.
What we have seen so far is that it appears that some themes or plugins may not be compatible with WordPress 5.5 due to the change of deprecation for the jQuery Migrate JavaScript library and those themes or another plugin are now breaking our JavaScript.
Does your site work normally with a default theme such as Twenty Twenty active and only Wordfence active?
You can forcefully gain access to your WordPress administration screen using the instructions below:
https://www.wordfence.com/help/blocking/troubleshooting/#forcefully-regain-access-to-your-site