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Is there anyone at the internship who can vouch for your skills, as you mentioned? Contact your manager and/or a senior person you worked with, and bring up that they'd be willing to speak to your skills in an interview.

No return offer is a red flag but not everyone gets a return, especially at megafunds, so I doubt the situation is that you are a perfect resume/interviewee and the MF rejection is your Achilles heel. You mention not networking - it's not too late to start and that's how most people get jobs.

BBs and MFs are done, as you said. Boutique/MM IB is still rolling, consulting is always an option. Some BB teams may still be recruiting for summer roles, if extending graduation 1 semester is doable you could look into that.