Which is better to invest in copy trading or bot
And is there any other alternatives
I have 4k btc to invest
Copy trading and bot-based trading can be tempting options, especially with a significant investment capital like what you have. But then, it's important to be very cautious especially if you're new to bitcoin. Both approaches involve risks and complexities that require expertise and experience to navigate successfully. If you're a new to bitcoin, I won't advice you take any of those options. As an alternative, consider starting with a solid foundation of understanding Bitcoin fundamentals, learning about market trends, and exploring long term investment strategies. Educate yourself so as to make confident decisions that will likely yield better results in the long run. While you do this, Hodl your 4k BTC please.
I doubt the OP will want to take that route as that would mean they will have to make a lot of effort to reach their goals, and it is obvious from their short post that is precisely what they want to avoid, in my opinion copy trading is not an option at all as I am not going to blindly follow the strategy of a stranger without knowing exactly why they are doing what the are going, now a bot could be an option but only for those which are expert traders and they are ready to automate their strategy.