Powering the Arduino and other sensors as portable one

Other Hardware Motors, Mechanics, Power and CNC
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So currently I'm doing a portable AQI monitoring device which has 5 sensors (both 3.3v and 5v), dwin display & gsm module. Ryt now idk how to power this entire in a portable way . Please someone help me

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You need one portable (battery) PSU for the ARduino, and another for the sensors. Since you have a mix of 5 and 3.3, you will need something like BatVolts ->5V->3.3V where BatVolts is anything more than about 7V. If you use the popular 18650 cell (make sure NOT fakes) then I would use 4 in series (parallel invites explosions) so I would use a combination of a buck, LDO and LDO.
4x3.7V=12.8 -> Buck to 8 -> LDO VR to 5V -> LDO VR to 3.3V
You probably will need bidirectional level shifters since you have a mix of sensors.
You could take a tap off the 5 for whatever board (I would use NANO)

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