Differential Equations: JEE Main 2024 Mathematics question

For a differentiable function $f: \mathbb{R} \rightarrow \mathbb{R}$, suppose $f^{\prime}(x)=3 f(x)+\alpha$, where $\alpha \in \mathbb{R}, f(0)=1$ and \lim _\limits{x \rightarrow-\infty} f(x)=7. Then $9 f\left(-\log _e 3\right)$ is equal to _________.