Specially ethereum nowadays because we are talking about a proof of stake situation and I believe it will be a lot better.
Now don't get me wrong this doesn't mean that all proof of stake coins are good, look at the rankings and you will see that there are not that many out there making everyone rich suddenly, obviously proof of stake itself alone is not something that makes you profit.
However consider it this way, ethereum is the second biggest coin in the world right now just after bitcoin and there will be no more miners selling ethereum to cover for mining costs, shouldn't that really make the price go higher?
I am not sure if the increase for that is already calculated in or if it is too long away for such a thing but I would say do at least 50% eth and 50% btc, if not even more for eth.
Ethereum is good but still it is risky if we will put all that money in one coin, I always telling that diversification is important because it helps us to manage risks. If I have that I will diversify it in 4 investment which are: 25% in bitcoin, 25% in eth, 25% in XRP and 25% in BNB. All of the coins that I mentioned are now in uptrend which means that the price is gradually increasing and there is a guarantee of winning as long as the uptrend will not snaps.
If we are talking in terms of entry points, for me the risks will be lessen if you will open a market order near at the support level because there is a high chance that it will bounce and make a swing high but you should put a stop loss beyond the support level in order to prevent huge losses.