If I keep sending bitcoin over lightning to my binance account , withdrawal and send again
Will this increase my inbound capacity?
The general answer is no, the gained inbound capacity from sending is not permanent.
As you withdraw from Binance to your Electrum via Lightning, your inbound capacity decreases by its amount.
It depends on the amounts though, "
sending" increases your inbound capacity while "
receiving" decreases it.
So whether it gains or not depends on how much bitcoins over Lighting you send or receive.