Any suggestion for things that we could invest and make money at the same time
I'm sure if I'm right but the thing that you are asking for isn't as simple as it sound like finding a good investment for you money that thing is rare. Things that you could invest in and potentially make money out of it at the same time you say might be investing in BTC while it is not harbouring a huge price, but in the future it will manage somehow just like in the past I think.
I agree with you, maybe the best investment is BTC, but once again with investment, he can know when the price goes down or rises if he can buy it when prices go down and sell it when prices go up will definitely get a good profit. And this investment can be for the long term, just let BTC and when you need to sell it.