You did a great job here and for them it can be a big deal as well like now they will also invest and they have become a part of the community as well. Although they bought at a good price but still things can go wrong I suggest if they have made the profit instead of giving them surety which most of the newbies need instead of saying book the profit and leave the trade, which I know is way hard for them because they think if we will be out we won't be making money, you just have to work on this.
Let them know that BTC can still dump, and can even go below 90k that time you should not sell in panic plus you should not have said the word guarantee because it was not suitable for you, I mean things can go wrong with BTC then it might come to your friendship I hope it won't go that way but better to be safe. So, ask them if they want to take risk, then take on their own I know they are smart by making things clear to them will safe you headache and any problems too. I do the same when I give suggestions to anyone, it's their take their risk so if in profit I am not being rewarded, then in lose I must not be blamed.
Yes, getting more people and increasing the adoption is amazing, it allows us to grow and not just in price neither. Think of bitcoin like a building, the wide the base, the higher we can go, you can't build a 100 story building with just 10 square meter base, you have to have it strong and very powerful for anything, that way you can make it a lot better and we can definitely make it a lot better on the long run if we have more people investing into bitcoin as well, doesn't matter if it is 10 dollars or 10 million dollars, as long as more people invest, that's good.
I also need to congratulate on the timing as well, it's obvious that we are getting to a great price, bull run was already coming and we knew it, and getting involved at this point is a great move, definitely something to consider.