More muscle has more potential to produce force. That is why most powerlifters spend part of the year deliberately building size. The trick is gaining mostly muscle instead of just getting fat and calling it a bulk. Done right, you come out the other side bigger, stronger, and still able to move.
Eat in a Controlled Surplus
To build, you have to eat more than you burn. But the dirty bulk, where you eat everything in sight, mostly buys you body fat you will have to diet off later. A controlled surplus is smarter. Add a few hundred calories above maintenance and aim to gain slowly, somewhere around half a pound to a pound a week for most lifters. Slow gain is lean gain.
Protein and Carbs Lead the Way
Keep protein at roughly one gram per pound of body weight to give your muscles what they need to grow. Put most of the extra calories into carbohydrate, since that fuels the harder training that drives the muscle gain in the first place. Fat fills the rest. You are not just eating to get bigger, you are eating to train harder, and the harder training is what actually builds the muscle.
Let the Scale and the Mirror Guide You
Track your weight over weeks, not days. If you are climbing too fast and getting soft, trim the surplus. If the scale and your lifts are stuck, add a little more food. The goal is steady upward movement on both the scale and the bar.
Building muscle is patient work. Push the food just enough to grow, keep the training hard, and give it months. The lifters who stay controlled through a building phase come out leaner and stronger than the ones who blow up and have to spend the next season digging out.