You have taken the wrong step, even though bitcoin is in a good trend at the moment in the market, this shows that there is no risk of holding bitcoin all the time, although in general you have not suffered big losses, but I think you have wasted a good opportunity at this time .
Altcoins also don't matter if we invest, even more perfect if we can also use bitcoin simultaneously in investing with altcoins, if one of them is problematic, then there are other coins that can provide good returns, that's why bitcoin and altcoins need to be invested simultaneously .
You should never sell bitcoin and always think to accumulate them. The future is of bitcoins and i believe that those who do not have bitcoin will be left behind.
You can trade or sell your altcoins but always keep on holding bitcoins.
But I really don't think that it was needed for us to keep on holding forever because we can't assure that Bitcoin will ever stay forever or if the price will stay strong and growing. I'm not against holding but sometimes we also have to reconsider some instances that might cause us failure and big losses. Like if I bought Bitcoin at $30k and sell them at $40k, that was an absolute profit, right? if you are not a greedy person, it is certainly good enough, IMO.
Indeed, an effective way to make profit in the crypto world is to take profit if there is an opportunity. Because maybe we will miss the opportunity
to make a profit if we continue to hold the coins we have. But this is only for people who do have time to monitor the market every day, so they
know what is happening in the market. For people who are busy and only have time maybe once a week to pay attention to Bitcoin price
developments, there is no harm in focusing on holding Bitcoin in the long term and only selling when the desired target is reached.
In the end it depends on the situation and everyone's strategy, because investing in Bitcoin is very flexible, do what we think is effective.