What got you here won’t get you there.
This applies to every single person interested in building muscle and strength. While newbies will see the largest gains, even advanced trainees can use this to continually have gains.
The concept is called progressive overload. It is simply that you need to increase how much you do over time both in the form of weight and reps.
This should help define the basis of your training – doing more than you did before. There’s a lot of ways to actually apply progressive overload – it doesn’t have to be just more weight every time you lift. (Though for beginners that’s usually how it looks for the first 6 months or so.)
If you lift heavier than you did last week or last month, you can be guaranteed that you will have built muscle and strength.