Safer to trade altcoins, I don't think you'd have the skills to trade bitcoin, hard to predict for anyone.
The plan is the same for every crypto trader, accumulation biitcoins with good potentiel altcoins
actually it's true, some traders only use btc as a pair trading, i even rarely active with btc / usdt. My strategy is almost similar, continuing to accumulate and only making large withdrawals 2-3x a year. The price of altcoin in satoshi which is smaller and more affordable makes the percentage of profit easier to obtain, and also faster when anticipating losses.
Yes, you take the example of Matic, you get a 500% profit in BTC just by holding it , if you had just traded the bitcoin instead, even trading good, you'd have made a 50% at most being the best trader and taking a lot of risks.
It is just not worth it to trade with bitcoins unless you already have a huge amount of bitcoins.