"I guess my contribution was to be collegial in a lot of ways.
"We are all elected here for our own reasons, we are all different, and we should respect those differences.
"One of my major objectives was to bring the place closer together and see what happens."
McKelvie had three members' bills pass through the House during his tenure, ranging from livestock rustling, speeding up court processing for dog control offences, and giving racegoers the option to bring their own drinks if a club holds an appropriate liquor licence.
He was selected assistant speaker of the House in March.
McKelvie's family has lived in Rangitīkei since the 1850s.
"I'm not one to talk about being proud of achievements, but I think the thing I've enjoyed the most is representing an area that my family has been part of, and consequently, all the people of Rangitikei are part of what I am.
"In this business you don't know where it's going to take you. You just have to do your best, stick up for your own people and hopefully have a bit of influence in what goes on."
He said he was confident "good and capable people would come out of the woodwork" in the next few weeks to announce their bids to fill his spot.
"There will be some great candidates to choose from.
"Again, the divisive nature of our society is a big challenge for new Zealand.
"One of the things causing that is the economy. Obviously Covid-19 played a role in that but I think we'll be treating it (Covid) very differently in the future."
McKelvie said he got on well with all his neighbouring MPs, regardless of party.
"When there is an issue we need to deal with, we can collectively represent our region.
"That's pretty important in a place like Rangitīkei. It's lonely in the middle of all the cities around it."
Farming had pulled the country out of the global financial crisis in 2008, and it was pulling it out again at the moment, McKelvie said.
"We've obviously got to change the way we do things in agriculture and food production, but farming is key to Rangitīkei and Whanganui area, whether it's trees or sheep or strawberries.