Buying ETH for long term hold is good at any time, but if you like to buy more of what you have now, you should wait until the price will dump, again, we don't know if it will dump but it's likely possible to happen.
I agree with this, it's just that using this method, we need to really wait patiently, and the worst thing is, the price will continue to go up. other than that, choosing bitcoin also only adds to the risk, well, that's my opinion. however, it is currently safe to invest in ethereum, it's just that if the price dumps, it could be a risk for you. I also suggest the same thing, namely waiting for the price to fall.