ETH, USDT, BNB, XRP, USDC, Cardano, Doge, Solana, Tron, Polkadot, Polygon, Shiba Inu, Toncoin, WBTC, etc etc are the top altcoins which I won't buy anymore because it's centralized, can be frozen in non custodial wallet and low security. There's no point for me to buy those coins since I need to check my coins everyday and make sure my coins not disappear.
Only few coins can be trusted, one of the example is BTC.
It is not easy to invest in altcoins because your mind will never be at rest. Bitcoin is the best to invest in because it is more decentralized than any other cryptocurrency you can think of. If you don't want to take the risk of investing in this altcoins it is better to go for bitcoin because it is more reliable to invest than the top altcoins in the market. Altcoins are are highly risky to invest, bitcoin is more preferable to invest without any fear.
to be frank most of the high ranked coin that are top 10 i think follows the pattern of bitcoin closely, no need to sweat about the fact that some altcoin might dumping because it just generally follow trends of bitcoin.
the thing altcoin i think that everybody already know is that its more profitable for a reason that is having more risk of fluctuation but even then at bullish the fluctuation is going more toward the bullish, some altcoin even go few time of its price in just one single swoop whenever bitcoin is rising. thats the advantage of investing in altcoin but of course with higher risk.
meanwhile if we just stick with bitcoin with our measly capital even if its the best investment as you mentioned it will be a slow investment to grow because lets be frank here, it become best investment that it attracts whales and big investment company to invest with hundred millions of money for us that invest at best few grand i don't think its good idea.