Of course i suggest to no one going all in, but let's see what will be the answers here.
It is a fact that no trader would go all in specially now that there are a lot of coins with potential but if I am to pick one coin to go all in within the next 3 days from now, I would probably choose any from the top 10. I think they are the most profitable and safer bet when going all in. Other than the top 10 I might not consider going all in on any project besides the top 10 coins because they are riskier and the chance of permanently losing my hard earned fiat is high on others.
Going all in has advantages and disadvantages, if you are able to guess correctly which coin is going to go up in value your profits are going to be huge compared with what you will get if you diversified your portfolio but the issue is that if you get it wrong and this happens most of the time your losses are going to be way bigger than the losses you could get with a diversified portfolio.