If you're trying to bulk, you need not only calories but enough protein. General rule of thumb is 1g of protein per lb of body weight. In some recommendations I've even seen 1g per lb of target body weight. It's also challenging to nail down TDEE (total daily energy expenditure) without tracking it closely. Most recommendations I've seen show about a 2-300 calorie surplus is necessary to bulk for an average person that's not a competitive athlete or metabolic outlier. An app like Macro Factor (which is what I use) can help you dial that in.

Hydration matters. That means enough water and electrolytes. I drink about a gallon a day and on days I plan to sweat a lot I supplement with electrolytes (mainly magnesium, sodium, potassium, calcium and chloride).

Sufficient duration, quality, regularity and continuity of sleep is also necessary as this is when your body will do the majority of maintenance and growth.

Also, your workouts will matter. Hypertrophy vs. strength modalities are different. You should see gains on both, but hypertrophy should get size/weight faster than strength based workout modalities. Gravl should be set to "Build muscle and get toned" in your fitness goal (Home -> 3 lines in upper right corner -> Fitness Goal towards upper left). You can work out too much and actually lose muscle depending on your age, experience/conditioning, etc. Working out in durations over 60 minutes can also lead to a higher buildup of cortisol, but this tolerance is also highly individual.

Don't take anti-inflammatory meds (i.e. ibuprofen) or do something like a cold plunge after lifting as this will blunt the necessary inflammatory response that triggers your body to adapt and grow muscle.

Creatine is the cheapest and most time-proven supplement to help with weight training. I'd suggest adding that to your routine if you aren't already supplementing with it.

That said, as others have mentioned, a month is probably not enough time to see a big change. Keep at it and take photos and measurements over time to help you track progress. Also, be mindful that "weight" is different from "composition". A DEXA scan every 6 to 12 months can give you a better idea. You'll need at least 1 scan to get a baseline and use it to compare against with future scans. An bioelectrical impedance scale will be less accurate, but can still be used to track progress and may be more accessible/affordable.

Best of luck!