Which is better to invest in copy trading or bot
And is there any other alternatives
I have 4k BTC to invest
A trade in which you want a bot to trade for you or copy other people's trade, you too can do so, All it requires you to do is just dedication of time and interest to learn how to do it. I highly discourage traders from depending on someone else to leverage the financial market when they can do it themselves. Think about if the system (bot) is no longer functioning or the source which you are copying from, meaning you are out of business.
Invest in yourself and learn the skill and it will forever be part of you.