Nice plan exchanger like Binance offer collateral loan with low interest. so we can invest our money on bitcoin and take some loan by collateral our BTC then invest in Altcoins. Altcoin is much profitable and when bitcoin pump altcoins also pump with Bitcoin. So if the market is good then in this case we will get several times more profit from both investments

why you advice to not touch alts? Are you too scared to invest in crypto?  Aren't You Aware of Altcoin Profits?  Yes investing in bitcoin is safer than altcoins but on the other hand altcoins are more profitable than bitcoins so if you want to get more profit you have to take more risk.