Many “own businesses” are lifestyle businesses and never grow beyond that, if they survive are often only marginally profitable.
If you have a skill you can use from home, Hairdressing, Accounts, Consultancy, you can do very well indeed, if can work out of the back of a van, Plumber, Electrician etc, again you can do well. You can expect to work much longer hours although it will be more flexible. The common thread is that you have to have a “skill” that others are willing to pay for.
Where you get difficulties is with overheads, rent, paid labour and all the other overheads a business has, this kills many startups.