Disclaimer: The solutions we've shared are just one exciting approach, and there are surely many other wonderful methods out there. We’d love to hear your alternative solutions in the community thread below, so let's keep the creativity flowing!

We can get an infinite amount of Taka from the machine.

Let $n_k$ denote the amount of money we have after $k$ exchanges with the machine. If we give the machine $x_k$ Taka s.t. $x_k>7$ in the $k$'th exchange, then the machine will return $2(x_k-7)=2x_k-14$ Taka. So, \[n_k=n_{k-1}-x_k+2x_k-14=n_{k-1}+x_k-14\]

So, if $x_k\geq 15$, then $n_k\geq n_{k-1}+1$.

We have $2023$ Taka in the beginning, so we can clearly give the machine 15 Taka in every move. So the total amount of money always increases by at least $1$.

$\therefore$ We can get an infinite amount of money.