making cron get the real username for a ssh only client

Apologies if i am not posting in the correct forum/thread.

i want to run a common shell script for all my python ssh clients, from cron. it looks like the below roughly

Code:

#!/bin/env bash
ACTUAL_HOME="$HOME/home/<real_username>"

export PATH="$ACTUAL_HOME/.local/bin:$PATH"
export PYTHONPATH="$ACTUAL_HOME/.local/lib/python3.11/site-packages"

PROJECT="$ACTUAL_HOME/no_venv/my_python_project"

sess="tmux-session"
if tmux has-session -t "$sess" 2>/dev/null; then
  echo "[$(date)] Session '$sess' already running. Skipping start."
  exit 0
fi

cd "$PROJECT" || exit 1
tmux new-session -d -s "$sess"
tmux send-keys -t "$sess" "python3 -m src.main && tmux kill-session -t $sess" C-m

it runs perfectly fine. the only problem is i need to hardcode the

for all the clients. i even tried to set the variable from outside the cron.sh, so it is just a matter of letting cron read it, but i failed. is there a way, i can make a variable via ispconfig-> cron jobs -> commands to run -> variables. if not what is the alternative.