Well I cannot say that 350$ is the new barrier. IMO, if we all sell this coming halving it will be sure to dump hard and in the worst case we can brake that buy wall down and make it go down a lot. On the other hand if we did'nt break it, it would be nice because it means it will rise again.
A lot has been said about bitcoin and the new floor. Some say 200, some 300 and my personal favorite is 330 dollar. This is based on the last price where a solid floor was established after massively selling. So yes it's a little bit under 350 and for me an acceptable price if the market will correct eh current price.
After the halving, the new floor will be around $500. That is the cost of the mining for many miners in the future.