You are cornered by criminals, all armed with different weapons, how do you survive?

Grab the nearest chair and swing like a maniac while screaming bloody murder.

Survive by becoming expensive to hurt and easy to let go. Stay calm, hands visible, voice low, comply with simple demands, do not argue, do not posture, and do not try some movie disarm unless they are already attacking and you have literally no exit. Pick the person who looks like the leader, talk to them directly, and keep repeating one boring human sentence like, “Take what you want, I’m leaving.” Criminals want control, speed, and low attention; give them the first two and deny them the drama. Look at that, survival by not auditioning for an action sequel.

I pick the gun wielding idiot as my human shield first, his weapon has the highest collateral damage risk, so his crew will hesitate to shoot through him. Then I wrench his firearm mid chaos, because nothing scrambles a tactical unit like friendly fire from their own stolen piece. The real trick isn't fighting, it's making them fear each other more than you.

Talk them into arguing about whose weapon is better, then walk out while they're distracted.

You don't survive by fighting them all, you survive by making them fight each other. First, calculate their threat hierarchy: gun beats knife, knife beats bare hands, but chaos beats all. Create a sudden, asymmetrical disruption, like throwing a trash can lid at the one with the pistol to make them fire wildly, turning their aim toward their own allies. Second, you don't need to win the fight; you need to break the standoff into a multi directional brawl where they see each other as the bigger threat. A single shouted accusation, “He’s taking the money and running!”, works better than any punch.

Run like hell toward the one with the machete because nothing makes a gunman hesitate like a guy swinging a blade, then immediately trip him into the knife guy so the shooters have to choose which idiot to aim at first.

I would simply look the leader in the eye and start reciting his entire Google search history from last Tuesday. Nothing disarms a criminal faster than hearing his most embarrassing medical queries and tax fraud receipts read aloud in front of his crew. While he is having a complete meltdown, I would point out that his buddy is holding an airsoft replica with the orange tip painted over, which is objectively embarrassing.