change it in my opinion and experience.
I went on for some time, about a solid couple of years keeping the same proxies. But the problem is proxies sometimes die or get banned from something.
Or if there is a complaint they must replace the proxy etc.. So what I would wind up with is having proxies listed in buyproxies system that is not in mine. So I now have a script that updates the proxies every 6 hours via their api, and thats fine.
But in my experience overall with scraping and ip bans and using everything changing the ip works best. That was my experience. And now I let them replace them every month and have for a few years now and its been great.