I feel the front end of your receiver is still worthy of serving you well. You would benefit driving your speakers with amplifiers that can effortlessly handle their low impedance. I followed a suggestion to select an amplifier well above the recommended wattage so a strong passage or sound effect would play without reaching the clipping level of the amplifier. No need to play at high levels to hear the benefit of an amplifier upgrade.
My system is a Yamaha RX-V777bt running as a preamp, Parasound A21 driving AR-303 L/R, ARC D200 in bridged mode driving an AR2c Center, ARC D200 driving a pair of Avid 103 for surround L/R, Kenwood Basic M1 driving a pair of ENERGY Connoisseur C-1 as Back Surround speakers. I upgraded the Bluetooth receiver to an XQ-50 Pro Bluetooth 5.0 w/ LDAC, digital out (coax) to the RX-V777. Audio from the LG 4K TV via TosLink.
My system is a Yamaha RX-V777bt running as a preamp, Parasound A21 driving AR-303 L/R, ARC D200 in bridged mode driving an AR2c Center, ARC D200 driving a pair of Avid 103 for surround L/R, Kenwood Basic M1 driving a pair of ENERGY Connoisseur C-1 as Back Surround speakers. I upgraded the Bluetooth receiver to an XQ-50 Pro Bluetooth 5.0 w/ LDAC, digital out (coax) to the RX-V777. Audio from the LG 4K TV via TosLink.