You asked how to lower the electric current, I told you.
If you don't have enough power supply you need to increase it. Calculate the required capacity of batteries and solar panels.. When calculating, consider that over time the solar panel generates less electricity, so there should be a reserve.
The way to reduce the power consumption is described above, but it is unlikely that the power consumption will be significantly lower than 2 watts. According to the data sheet, the maximum consumption of SXTsq Lite5 is 6 watts and this is the power you need to calculate when choosing a power supply. Peak power is usually consumed at power up or reboot. If there is a power shortage, the devices go into a cyclic reboot. The power consumption increases slightly when the air temperature drops, which often prevents the devices from starting in freezing temperatures. When the temperature drops, the battery capacity also decreases.
In general, you have chosen the wrong way, if you want to build a stable, reliable system, you should not try to reduce the power consumption, but to find ways to provide the devices with sufficient (redundant) power supply.