Is there any altcoin that has so much potential as use case in our lives?
Short answer is No.
It seems that even major altcoin like Ethereum still struggles with securing stores to be used
Bitcoin is the only coin that you need to keep store of. With more merchants coming up with a pro-crypto attitude and more lenience from authorities to use crypto, being optimistic, they would without any doubt use bitcoin as the first option for taking payments. Now altcoins can be there but bitcoin will always be there.
Hence altcoins can be a life saver when bitcoin network becomes congested but dont get me wrong here. Alts dont have anything worth investing in them. So use them with caution. If you local grocery store accepts bitcoin, use bitcoin. You will be much better off having to juggle a hundred alts than one which is the leader of all crypto, bitcoin.