For this challenge, we are given the following string:
V1RJeGMySlhVa1pVYkZaVFltNVNTMXBGYUU5YWF6VkdaVVV4V1UxclduQlVWV2hYVFVabmQxTnRhRlpsYXpRMQ

From previous experience and intuition, this looks like base64. We decode this and get:
WTIxc2JXUkZUbFZTYm5SS1pFaE9aazVGZUUxWU1rWnBUVWhXTUZnd1NtaFZlazQ1

This looks like base64 again. We decode this and get:
Y21sbWRFTlVSbnRKZEhOZk5FeE1YMkZpTUhWMFgwSmhVek45

This looks like base64 again. We decode this and get:
cmlmdENURntJdHNfNExMX2FiMHV0X0JhUzN9

This looks like base64 again. We decode this and get:
riftCTF{Its_4LL_ab0ut_BaS3}

Flag: riftCTF{Its_4LL_ab0ut_BaS3}

Original writeup (https://github.com/joeyjon123/riftCTF/wiki/Crypto-0x001).