Question about storing data on public blockchain?

A lot of business guys had been asking me recently about how to implement public blockchain in their business. As a developer myself, I really got no clue.

Aside from token, nft, defi, trading. Businesses can’t store information over public blockchain cause the transaction cost is too expensive.

Dear community, how did you all implement public blockchain in the real business world?

You can ping me up over linkeln or twitter. Let discuss about it.