Lotion and collagen powder! I recommend the Vital Proteins brand- my nails are so unhealthy without it. I receive infusions for an autoimmune disease and its done wonders for hair, skin, and nails
Your dry hands are the problem. If our cuticles are dry, your nails will be dry. Wear gloves for cleaning. Then moisturise them after. Don’t use hand sanitiser, that’s drying AF. Use a moisturising hand soap and then a lotion. Oil your cuticles every day w some olive or coconut oil. Then your nails will become stronger w the oils you are putting on the cuticles because it’ll saturate into the nails as well. Push back cuticles, cut them, oil them. Then put a strengthener on the nails. You can buff the top of the nails slightly w a buffer before you put strengthener on. Get some cheap empty nail polish bottles and put some coconut oil or olive oil in it and every day brush onto your cuticles and rub into your fingers and hands. Or buy some cheap cuticle oil pens from Shein, which already have oil in it you just take off the lid and brush it on.
Your hands always being dry could be part of the problem. Try using a thick lotion every night, making sure you rub it into the nail and cuticle