Should I create an installer every time I wanna upgrade?

I installed macOS high Sierra on my Lenovo IdeaPad 510-15IKB yesterday and I tried upgrading to Mojave. Installer says restart Mac and when I do restart, the installer starts again from the very beginning. Is there a workaround or should I make a bootable USB everytime I need to upgrade?

submitted by /u/Teja1821
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