If you search about predictions, you’ll find bags of predications, predicated by so called predictors. 4x is possible number regarding bitcoin price but it seems impossible if anyone says 33x... That's biggest number, I'm just fail to imagine. Well bitcoin and eth are always suggested. You can go for 5eth, 0.4 btc and buy some valuable coins with rest of that 0.1 btc, that could be bnb, matic, dot, arb and Others.
I may be wrong, but I think that an important factor preventing people from buying BTC (aside from volatility) is the fact that 1 entire unit of it (1 coin currently being above 25k) is already far out of their price range. So they think "it is not for me". Imagine that instead of buying bitcoin, people spoke about buying Satoshis. Then all of a sudden it seems way more doable to the middle class. More money could flow in.
It is psychology but I think it matters a lot. It feels better to own 4000 of something, than 0.4.