I think if you really have a lot of capital, a profit of 0.5 btc a day is perfectly achievable. You may be referring to the ICO project you have invested in and earning a profit from it. I would like to congratulate you on becoming a millionaire thanks to the crypto market like other investors. Make a big investment in coin you really trust, I think your capital will continue to grow.
If you invest more then there is a chance that you can also lose even more if markets go down. So don't think only in one direction when you want to make an investment decision but you also need to consider a risk factor as well.
Don't believe on these signal sellers because if they can find so accurate signal then most likely they will never sell those singles to you instead they will be busy in making money from those signals but they know that they can't do it so they use this method of selling signals to others to make money. Most of the time they just copy and paste singles from other groups. It is actually wasting your time and money.