There is a professional foundation that has been steadily rising for one and a half years, which is scientific and reasonable, and also has genetic advantages. Not taking medicine is basically the limit that can be achieved by hard work. The higher it is, the range of action of hormones is beyond human strength (but even taking medicine is 30g).

As for three months ago and two months ago, it was basically a pure adaptation period. Just practice the essentials and simple scheme of the whole set of equipment in the gym. Strength will increase rapidly (for example, bench press from 35kg to 50kg, sit-ups from 30 to 60), but it is hard to say how much weight the muscle can gain, whether it is visual or real size (if the diet can't keep up or even be lighter).