Hello, idmesspass!
I’m glad you like the theme.
You don’t need to worry.
Blocking the IP address from which the attack comes is a good enough solution.
Each of the plugins can be attacked. So it’s good to have a firewall enabled. Since the Slider Revolution is very popular, it is not uncommon for this to happen.
Please, update your theme and plugins to the latest versions (current theme version is 1.4.9.4 and Slider Revolution 6.2.10)
https://prnt.sc/thewtd
Also, I didn’t see you are even using Slider Revolution somewhere, so if you don’t use it, simply deactivate it.
Best Regards