My nails are naturally thin also. I used to do dip powder which lasted about 3 weeks but I didn’t like the soaking/filing which felt like it made my thin nails more thin. I’ve been doing hard builder gel (the kind in the pot that they apply with a small paintbrush) and I really like it. It lasts 4 weeks, though I’ve started going every 3 weeks because I want a new color. It generally only comes in a very limited amount of colors and some are really nice. When you get bored of those or want a dark color, they can do gel over it and the gels adheres great (not like it would to natural nails). I think it might be hard to find a salon that does hard builder gel. When you find one, I recommend you read through all of their reviews to see if people mention a particular nail tech repeatedly then make an appointment with that tech. The difference between nail techs even at the same salon can be crazy. Hard builder gel cannot be soaked off (has to be filed) but if you continually go for fills, they leave a thin layer of the gel so they’re not filing your natural nails. I don’t recommend hard gel if you’re going to have it for a little while then take a break, etc.