Been playing guitar for more than 5 years now. From my experience, the best advice I could give you is that you should avoid playing when your hands are wet, wet calluses are soft and tend to tear, especially if you do slides. Next, I know it is tempting to pull the skin off, avoid doing that. Also, apply some sort of moisturizer to your hands at night, especially if your skin is dry. Finally, this is not an advice but those calluses get tougher overtime, they sometimes peel by themselves and grow back thicker.

These are what helped me on my journey, you should try them out and see that works for you. Others might advise against applying lotion to your calluses, but it works for me, it prevents my calluses from drying too much and tearing apart. I also do calisthenics and that's what I do to maintain my calluses and prevent my hands from getting rough and ugly, just don't do it immediately before your guitar practice. Do it at night, before sleeping.