Any specific brand I should be looking at? What can you tell me about your bike specifically?
I’ll preface by saying, it really depends on the budget. But good bikes start in the mid-1000’s and go up from there.
Most bike manufacturers that you may have heard of (like Trekor Specialized) make a gravel-specific model. It will have drop, road style handlebars as opposed to flat, mountain bike bars. Tires will be wider than a road bike and a little more textured, but not extremely wide or knobby like a mountain bike. Two main frame types are aluminum and carbon fiber. Aluminum is cheaper, but carbon fiber is lighter. Either one would be a good option.
Depending on the mode you may get a 1x or 2x crankset (the front gears where the pedals are). A 2x will have a big gear for speed/power and a smaller gear for climbs (like a 50 & 34 gear). A 1x will have something in the middle of the two (42 or 46 or something). Either option will likely have 11 gears in the back—that’s pretty standard these days. Upper end is electronic shifting.
Then you have brakes. Traditionally, there are rim brakes that have a brake track on the wheel itself. More recently are disc brakes similar to what are on a car. Mechanical disc brakes use a cable pull and hydraulic disc brakes will either use a standard brake fluid or mineral oil to press the brake pistons on a rotor.
Generally, cheaper bikes will be aluminum with rim brakes. Nothing wrong at all with those machines. As you pay more, you get lighter frames and components.
My bike is a Cervelo P-Series which is their Triathlon/Time Trial specific model. It’s designed for going fast on pavement. Gravel and mountain biking are strongly discouraged on this style of bike. The bars that stick out front are so the rider can get into an aerodynamic position. It’s a mid-ish range model. Carbon fiber frame, hydraulic disk brakes and the mid-range performance road group set (gears and shifters).
EDIT: Sorry if I rambled and didn’t answer your question. Since I haven’t really researched gravel bikes, I’m not sure what to recommend. But I tried to include some general information and things to look for.