Nothing can convince you 100% about the future of bitcoin – including its price. This is something special about bitcoin which is basically believed to be an asset that performs well compared to many other investment assets – but still consider your risks if you want to invest. The facts are like that - but volatility is just a dynamic that will be present in trading all the time.
If you want to invest - then do analysis. We cannot guarantee that you will get a return from your bitcoin investment even though there are factors that support that - but once again you are the person most responsible for whatever your own investment decisions are. Do analysis and research and don't take other people's predictions as financial advice.