I would always have recommended Madcow 5x5 for intermediate lifters (where the level of lifter is defined in https://exrx.net/Testing/WeightLifting/StrengthStandards )
Though it sounds like you may have a while to go before you get to intermediate. If I were you, I would want to explore more of what the gym has to offer as I continue to lift more. Maybe see the difference between dumbells and barbells. Maybe check out some auxiliary lifts exrx and add them to your routine. You could also think about changing up the amount of reps you do - when my buddies and I used to stall on lifts, we would lower the weight and increase the reps before lowering down the reps again. 3x5 is a small amount of reps, but you do have the big 5 barbell lifts in there.
If you really like going in with a set routine, then I might try changing from Greyskull to Stronglifts 5x5 . If you're feeling spicy, you could try German Volume Training which is 10x10 with short rest periods. But honestly, there's a lot of ways to do resistance training and the worst one is to stop. If you keep showing up and increasing the weight, the results will come. Lifting is a world for you to explore and sample.
I would always have recommended Madcow 5x5 for intermediate lifters (where the level of lifter is defined in https://exrx.net/Testing/WeightLifting/StrengthStandards )
Though it sounds like you may have a while to go before you get to intermediate. If I were you, I would want to explore more of what the gym has to offer as I continue to lift more. Maybe see the difference between dumbells and barbells. Maybe check out some auxiliary lifts exrx and add them to your routine. You could also think about changing up the amount of reps you do - when my buddies and I used to stall on lifts, we would lower the weight and increase the reps before lowering down the reps again. 3x5 is a small amount of reps, but you do have the big 5 barbell lifts in there.
If you really like going in with a set routine, then I might try changing from Greyskull to Stronglifts 5x5 . If you're feeling spicy, you could try German Volume Training which is 10x10 with short rest periods. But honestly, there's a lot of ways to do resistance training and the worst one is to stop. If you keep showing up and increasing the weight, the results will come. Lifting is a world for you to explore and sample.