There is currently a fee bug with Monero, that the wallet doesn’t automatically bump the fee when there is a backlog. This fee bug is causing sync issues with many wallets. The bug has already been solved with Anonero.io, and other wallets will be rolling out fixes shortly.
There are rumors that Nostr's creator is behind a spam attack. Simplified Privacy addresses this and has a ready working solution: https://simplifiedprivacy.com/monero-attack-nostr/
Tor Browser Onion: http://privacypkybrxebcjicfhgwsb3coatqechwnc5xow4udxwa6jemylmyd.onion/monero-attack-nostr/
Monero will weather this and be fine. I'd prefer to wait on tx at this point rather than consider LN as a better alternative.
What service are you using that generates the mempool tx with those graphics?
Edit: nevermind, found it: https://tx.town/