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Lots of opinions here, but let's look to a higher authority. According to the Chicago Manual of Style, the word after a colon is lowercase, even if it starts a complete sentence, unless it's a prop...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44522 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Lots of opinions here, but let's look to a higher authority. According to the _[Chicago Manual of Style](https://www.chicagomanualofstyle.org/book/ed17/part2/ch06/psec063.html)_, the word after a colon is lowercase, even if it starts a complete sentence, unless it's a proper noun. The exception is when the colon introduces multiple sentences or when it introduces speech.