If you want to diversify it, make whole altcoin less then your btc holding. Example : 60% btc, 20% eth, 20% bnb, ada, solana and other alt. And i dont recommend doge because the doge price is too high right now. And it could be worst when btc dominance market increase.
That's right, the examples and ownership strategy that you said are very suitable for anyone to apply because now the market has started to look recovering even though it hasn't fully recovered, but putting assets on the three coins you mentioned is a very good thing.