$BASE has a very interesting use case. The issue is how they are going to maintain the peg. $BASE can act like an index fund for the entire crypto market. But I don't see a reason to HODL for the long term without any assurance on the maintaining of the peg. Even DEC has not been able to hold its value at $0.001 despite your ability to make purchases at 
As for use cases, I would seriously recommend Dash. https://www.dash.org is everything BTC aimed to be. You already have 1 second transactions with InstantSend feature. You have privacy with PrivateSend (on chain mixing service with 4-16 mixing rounds the last time I checked). Dash is literally the first DAO. At ATH they had $10 Million USD monthly budget.
Dash became hugely popular in Venezuela. You can take a look at https://discoverdash.com for Dash accepting businesses
RE: 3 Altcoins for your 'everyday' usage.