Cost effective firewall solution for small hotel.

Small hotel - 37 Rooms.

Looking for a new firewall solution due to P2P infringement notices. Have considered PFSense, Zyxel, Ubiquiti. Currently the hotel is utilizing the following hardware:

TP-Link TL-ER6020 Router

Rosewill RGS-108P POE Switch (Guest PC+Conference/Meeting Room+AP)

4 x Zyxel NWA1123-NI AP

TP-Link TL-SG1016 Switch (Handles Office PC+Printers)

Am looking for an effective yet cost effective solution to the problem. Was looking for recommendations. Am leaning toward Ubiquiti and PFSense as Zyxel, Sophos, etc. require subscription services moving forward.