There are many new people who are interested in Bitcoin but still cannot easily buy Bitcoin,
If they are internet or technology illiterates, then that's a different thing, but if they are not, the process is pretty straightforward. All one needs to do is to create an account on a centralized exchange, verify their account, and then use their P2P platform to purchase Bitcoin using fiat. One can even use a decentralized platform such as Bisq if they don't want to do KYC at a centralized exchange.
Many lose interest in buying again because the purchase price is shown higher than the current price.
That's called volatility, bro, anyone who doesn't know anything about that are not qualified to buy Bitcoin or any cryptocurrency because they are basically clueless about what they are getting into, and they first need to gather enough knowledge about cryptocurrencies and then rethink on their decision whether they should or shouldn't invest in them.
Can't there be some simple strategy that people all over the world can easily buy Bitcoin.
Do you mean there should be merchants loading your wallets with Bitcoin in exchange of fiat in local shops? Well, maybe in the future. For now, people will need to do it themselves, through the internet and exchanges available.
Although I am working on this topic and have also created a website. I need a good consultant and investor who will give me wisdom, listen to my method and control everything.
You will need to explain this a little more for us to understand what you are trying to achieve.