Hello, I'm having issues with the signal strength due to the high density forest. Average signal I got form EAP650 to EAP225 is -90 dBm and I wonder if I could buy bigger or different shaped antennas

I started with a small network with only two EAP225 but with the demand, the network expanded. As an Internet source, I'm using MikroTik LHG LTE18, before I used Huawei B535 and never had any issue. T