You're setup is a fairly dangerous config to use. You only have 1 out of 4 layers covered. The only one covered is Windows Firewall.
Please consider the following below so you have a secure config:
1st layer: real time protection or 3rd party tools: use an AV of your choice, or use OSArmor with Syshardener. With Syshardener you can also use the setting to have some basic Firewall settings which will further harden your protection and OS.
2nd layer: Web browser protection, this can be protected using an Adblocker like uBlock or Nano Adblocker alongside ScriptSafe for script blocking protection
3rd and final layer: backup, I would recommend Macrium Reflect as your backup solution because its essential, so you don't lose files from deletion or a ransonware attack
~LDogg