Most hearing aids and sound processors have a setting built for exactly this room. It might be called restaurant, noise, or speech in noise, and it usually narrows the microphones to focus on what is in front of you while turning down what is behind. Some hearing devices switch on their own, some want you to pick it in the app. Find out which yours does while you are at home, not while the appetizers arrive.
A remote microphone is the biggest single upgrade for a lot of people. It is a small mic that clips to your dinner companion or sits on the table, and it sends their voice straight to your ears without the room in between. If you have one and it is in a drawer, bring it.
If restaurants are still rough with the settings you have, book an appointment and describe the exact situation — which restaurant, where you sat, what you missed. That kind of detail gives your provider something to adjust.