If your investment has already hit the profit mark then you should sell and check out any other best altcoins. Because we have not yet seen bullish excitement in the altcoins market. So if there is a bullish trend in the altcoins market in the future you will get good profit. Moreover the price of bitcoin has increased so much that dumping can happen at any time. But bitcoin is always the best investment but you need to have the skill to buy and sell at the right time to get good profit. If OP wants to make a quick profit then the best time is to have fun with some good altcoins.
Since some altcoins are not yet pumping in the market, you can invest the half of the money on altcoins and save the remaining half in case BTC price dump you can invest again, and start waiting for the altcoins price to pump higher to earn from the investment.
Solana and Dogecoin is in a good position, to give you the kind of profit you are looking for in altcoins investment because the coins price is still low in the market for you to buy and hodl because there are some positive sign that prove that their customers will going to earn well when altcoins bull season occur.
Never you allow anybody to deceive you, that BTC is not the best investment because you can see what is happening to those that market their BTC in the month of march and April and it helped them to achieve high profit from their investment, I will advise you to always include BTC in your investment.