That's fair question, however, Bitcoin remains focused on a vision of a global peer-to-peer economy, and into such upgrades lie the keys to solving its scaling issues.
Bitcoin developers have many things in their consideration and to-do lists, not only scalability. Scalability means nothing if scaling up means less secured blockchain. So far, we have Bitcoin as a biggest and most secured blockchain to use, that's good and altcoin blockchains can not compare to Bitcoin blockchain in security.
6 confirmations on Bitcoin blockchain in security equal to hundreds to thousands of confirmations on altcoin blockchains.
https://howmanyconfs.com/The Lightning Network provides for speedy and cheap transactions by processing them off-chain. Hence, congestion on the main blockchain is reduced.
There are more solutions, not only Bitcoin Lightning Network.
Sidechain Observer - Bitcoin L2 Projects & current state of developmentAnd blockchain, mempool congestions come from non-true Bitcoin users like Ordinals, Runes users who even don't have enough knowledge and idea about Bitcoin mempools and transaction fees as well as don't care about safety of their own capitals. If they buy bitcoin and hold it, they get profit but by purchasing Ordinals, Runes tokens, they lost money.