I need to open the terminal on startup and execute three commands in the same window automatically on my Raspberry 4B. The first is a cd command. The second one is: source /tflite/bin/activate. And the last one is: python program.py. After executing the last one, I need to keep the program running. I've tried solutions from similar threads like: this or this but none of them worked for me. I also tried making an sh file, which executed the commands separately and had some other issues (The python program was executed and was running in a loop (which was intended) but when it got a point when it had to run another program it did nothing although it normally works.). I've also modified the ~/.config/lxsession/LXDE-pi/autostart file, but it didn't work.
It sounds like the issue is you want to run those command in a terminal. Put them in a script and then execute them from the LXDE autostart this way:
lxterminal -e /path/to/script
Note that this terminal will close when the script finishes, which should be okay if it starts a python program that loops. Otherwise, add
bash to the end of the script to keep the terminal open.
It seems there are some caveats about using the per-user autostart file you should be aware of: https://forums.raspberrypi.com/viewtopic.php?t=294014
For more details about using the terminal see