Add more sealant and ride again, imo
Even if its fully deflated now? Would it help going to a petrol station, deflated the tyre and inflated with the big air things they have there or not really?
Just re inflate it the same way you did before. Maybe if it's totally flat the air is leaking out the bead but it's hard to say from here.
I doubt that a bigger air burst will make a difference. That's just for seating the bead in the first place.
@M4xime started
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Add more sealant and ride again, imo