There’s several apps out there to help you adjust the altitude up to 30m. I use “AltLimitTELLO”, it only cost $.99 and works great. You only have to adjust it once and it will save the settings for future flying.
This is what has worked for me when flying in fairly windy conditions for the Tello:
- Take the propeller guards off
- Use a Wifi extender
- Fly in “fast mode”
- Change the Attitude Angle to the maximum (25%)