What could be the solid retirement plan? Maybe investing in real estate, stock market, crypto market, and maintaining a healthy bank balance. Do you have a solid retirement plan, what does your retirement plan look like. As far as I am concerned, having a house, sizable savings in the bank, stocks in a few reliable companies, and also crypto, and a passive income is my solid retirement plan. I believe with this kind of diversified portfolio, I can live comfortably in my old age without financial worries.