Hello everyone I am new here, and I want to start investing, lately the
DeFi Project is good this year, there are many ubiquitous DeFi projects, both on Twitter and on the Telegram channel, Am I investing in every DeFi Project that can make a profit?

another one is DeFi becoming a promising business in the future?

Basically these hypes will be here only for short term so it is your own choice to invest on decentralized Finance aka DeFi projects.Maybe this has got some potential but if we are already reached the hype so any time this will get hard hit.
First of all we need to have decentralized payment system which itself is in the infant stage of adoption.