I would say don't sell your altcoins
yet, it's not even worth it to sell today as the price is not that good for altcoins in general. If you are okay with cut losses and don't bother with profit then go ahead, but it doesn't hurt you to actually worth for few months so you can get something back from altcoins.
If you have better analysis than only optimist we're like to know that. There's possibility bitcoin will lost value after halving and this movement ( right now ) is just bait to invite people join in whales game. Take care your money before they take it.
So does altcoin, they will lose its value later so why don't you join the game and leave later?