You will need at least a new Breaker panel, ATS, 50 Amp plug and upgraded wiring to/from these devices.
If you just want the extra capacity for a second Air Conditioner, it may be more feasible to run an individual 20 Amp circuit to it directly with it's own plug and then use a 50 Amp plug/adapter like this:
https://www.amazon.com/Conntek-Adatp.../dp/B003YDY89Y
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