Your second option is a hot air brush. It’s a round-shaped electric tool that can be used for both straightening and curling. But you probably will be able to create gentle waves rather than tight curls with this appliance. Hot air brushes can comb, blow-dry, and style your hair at the same time. It’s a good choice if you want to add extra volume or just keep it.
A replacement as loved the first ghd straightener I bought.