Very true. Bitcoin also doesn't give any shit on other altcoins. This is also from my experience before. I got big regrets before, holding too many altcoins or swapping my Bitcoins before to altcoins were my biggest regret.
Now, I already learned the lesson.
I barely even owned any altcoin other than USDT, and it was only a few moments before I found another dip and invested. I only own bitcoin and that's the reason why I invest in crypto. Some altcoin I might also consider, but not at this time because I think maximizing opportunities to buy bitcoin cheaply will be more difficult in the future, and this is it.
When I feel the target or amount of bitcoin I have collected is sufficient for the long term
[according my budget] then maybe I will consider 1-2 of the best altcoin for investment. I understand that some people may be skeptical of altcoin, but I'm not entirely. But now I think it's not the time to think about altcoin because I think this opportunity really should be put to good use.