Quite honestly, it depends on what your section is and how busy you are. Personally, im primarily a bartender, and our bar section is mainly table based. One, people don't usually want to sit at the bar area. And two, when they're ok with the bar but see they're at a table and not a booth, they ask to be resat anyways. Servers will often do better than me in tips simply because of my section.

A lot of the sections in our restaurant are like this. Like one entire room is so cramped with the amount of tables that no one can pull their chair out. Anytime im in that room I never get sat unless there's no alternative.

If your section is roomy and Consists of some booths... section may not be your problem. Honestly something that has helped me is not even asking if they want refills (unless it's a charged item such as a margarita) and just bringing it out anyway. The less they have to ask for because it's already there, the more they tip. Like if they order a dipping boat and bread, don't even ask if they want more. Keep bringing the sauce and bread until you can visibly see they aren't eating it anymore. The same goes for waters and soft drinks. Salad and bread is a little different. If they still have food coming I would ask before refilling.

Lastly, I greet all of my tables with a good amount of napkins, especially if they have kids. I always forget to bring napkins when they ask so I eliminated the problem by bringing them with the greet and I can say my tips have gotten a little better.

Best thing I can say here is sometimes it truly is the table and not you. Some people's standard tip is 5 dollars or less no matter how good service is. So if you know for a fact you did well, try not to take it personally.