this time transaction stuck unconfirmed for 48 hours( i think they put low fees 286 sat).
That fee is low right now. That will not confirm quickly on its own.
Should i try and accelerate transfer by myself
You can certainly do that if you like.
or wait for them to act(they support is very slow).
You can wait if you prefer to wait.
I afraid that my btc will be lost in limbo.
Bitcoins don't get lost in Limbo. There is no limbo storage in the protocol.
And if i accelerate it myself ,will it interfere with they actions?
No. Your attempt to accelerate will not interfere with anything they do.