There are many ways to change your IP but you should at least mention the purpose. If it's just to browse internet or access blocked sites, you can use TOR browser. If it's for Google or YouTube, you can use a VPN as you get captchas while using TOR. If it's for a software like GSA SER, you need proxies. I have a 4G mobile data, so I just turn off and on data to get a new IP address. Find a method that best suits your needs.