Do a shadow swing, and don't forget to do strength training as well to accompany the shadow swing drill.

Do a forehand swing 100/150 times in the morning, another 100/150 in the afternoon, and another 150/200 in the evening. It will take 5-10 mins.
Remember, to aim for consistency and correctness of the movement and timing, not swinging fast / powerful / hard. You want to build the muscle memory to the swings, adding power is way easier when you have constant swings.

Don't know how a good swing looks like, go find youtube tutorials, start with the basic, then increase difficulty.
Trust the process, and don't rush. In a week you will feel a difference