It cannot be too late to deal with mining; it is just the question of a competent choice of the equipment and its operation (equipment management). There are many services and companies which offer operation and maintenance of this equipment for a profit share, thus a user receives a convenient service while maintaining high potential profitability.
Independent mining including purchase of accessories and collecting so-called farms is not of current interest because the effect will be not so big. It is easier for a common user to invest in "cloud mining" that is to rent a part of a datacenter capacity and to get passive income.
Now the era of industrial mining comes, and large investors with dozens and hundreds of millions of investments come to this industry.
Nevertheless under certain conditions even the domestic mining can bring 50-100% annually (and sometimes more if you are lucky and the rate seriously grows).