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Contact with meme pages for posting there song with meme or post.. Nowadays meme pages and Instagram pages are easily help to knowing about song ( as per my observation)

Maybe select one of his best songs and get it viral by connecting influencers and maybe ask them to make reels on them in collaboration.

I will suggest that Take a reel video of that singer and share it with meme pages like trolls official give it to only 2 3 meme pages tell them to post it in such a way like (Wow what a voice ). And mention that singer in caption. If their voice is really good then automatically people will open the account if they like it. "Do this on Instagram"

can you show me his profile that I can best suggestion to you?

Instagram profile should be top notch. Get him gigs at popular places especially around students. Get influences to tweet about him.

You are a marker and you are asking how to market ( aka making famous) wow! Reason why most are unemployed

You should use his songs audio and ask small creators to post reels with that audio thats how he will be famous soon because of his song

Copy paste same question in chatgpt and go from there

Create reels of them covering famous in-trend songs consistently on Instagram and shorts. One will blow up (if they are a good singer).