You should not sell bitcoins on this moment, if you wan to sell them so bad you should wait a couple months and see what the halving is gonna do.
If the halving is good you will make a lot of profit if this is not the point you will most likely makr normal profit.
So what I could consider is waiting a couple months.
Wait a couple of months to see what the halving will do? I am sure you are mixing up a few things as the block halving has already been completed in Juli this year. Next block halving will take place in 2020... Other than that, right now is a perfect moment to secure profits assuming you bought your coins well below the current price. Waiting for the price to go up more is not a wise thing as the price can't just keep going up endlessly.