i have been scrolling down the bounties section and seen so many projects related to Defi and Bitcoin but i cannot understand how the new project like Defi is giving a hard time to BTC and even to other altcoins like ETH and ripple and many more?
every post and campaign i am seeing is about Defi and its making more money than others/
why?

DeFi is indeed good and has very sustainining projects in the crypto currency space; with good amount of adoptions too, but it cannot compete with bitcoin; etherum, ripple with amass of volume has yet to compete with bitcoin; defi has yet to compete with etherum, then bitcoin ? By now you should understand how the markets work, do not let your emotions get a better of you at all.
Always do your own research.