You are right, indeed anyone can make a profit from trading as long as they have good skills and knowledge about trading and choosing to invest Bitcoin in the short term is highly discouraged because the price of Bitcoin is very volatile so this will be very unlikely to be able to generate profits in the short term, but it would be great if we continue to accumulate Bitcoin assets and hold them for a long time to be able to make a profit from holding these assets and we also have to keep planning before deciding to start in order to be able to run the investment properly, as you said it is very right we have to think about emergency funds so as not to interfere with the assets that we have invested when we suddenly need the funds.
Let us not deviate from the purpose of the thread, we are discussing about investing in bitcoin and not trading them for short term or long term as an alternative to get profit from them. Trading is risky and investing in bitcoin is not as same as trading. With an already established mindset to focus on investment, you need not to be worry about what will cost you your money being at risk of losing it or not. Long term investment in bitcoin is proven to be the safest way to earn profit from this investment, so sticking to it will give a good outcome to your investment instead of regrets of having to use another method to earn profit from bitcoin.
Let's not also forget that people that buy in lump sum always do it when there is Bitcoin price dip.
Your statement is not correct. People who invest with lump sum don't always invest during the DIP alone, they invest in bitcoin whenever they have the funds ready available. It all depends on the prevailing market conditions at the time the investor wants to make his purchase. Your statement can be misleading especially to newbies and visitors of the thread.
Lump sum can be done at anytime and it doesn’t matter the market condition at the time of doing it. Lump sum is another strategy you can use to accumulate bitcoin and being a starter pack strategy to some depending on their income, it gives room to accumulate some reasonable amount of bitcoin at a start and continue DCAing subsequently to continue growing your portfolio if you can’t keep up with lump sum from time to time. All strategies are good, you just have to check the one that best suit your means of income and apply it.