You are right, because everyone has a choice to make and so knows what works for them better, there's actually no need trying to convince someone who have a different perspective about something different from yours.
Apart from everyone have a choice, the way and manner OP explained the scenario is not a good thing to do even if you have made millions and that your friend is yet to invest, there is no need to blast him publicly because Bitcoin transactions itself is not legal in Nigeria.
Bitcoin is still subjective across different arms of government. So far, what we have understood is that the government is more focus on trying to avoid people from having access to usdt and NGN market than the crypto itself. If the government really want Bitcoin and crypto to be ban, they would have announced it and tells us that to stop invoking in crypto transactions but so far, their main focus is p2p market which they think it's because of Binance and other exchanges that has allowed Nigerians to trade.
With the way things are changing in the country, it's actually better to avoid public display of Bitcoin or anything that concerns cryptocurrency because of how abusive some law enforcement are when they see an opportunity, they would want to use you as scape goat for extortion because they know nothing about the law.
Bitcoin investment is a choice and no one should be blamed if they don’t feel comfortable to invest; some of us wants to invest but they lack capital to start the investment while some have the capital but don’t feel comfortable to invest due to fear of market volatility.
At this stage I'm, I don't want to teach or involve anyone to buy Bitcoin, not because I don't want them to buy or invest but because many of them are impatient these days, they just want to invest and get profits withoit understanding what they even investing there money into. If they want to invest, the condition is I will teach them first before they invest.