The xLSTM could become a good alternative to transformers: https://arxiv.org/abs/2405.04517 . On very long contexts, such as those arising in DNA models, these models perform really well. There's a big state-space model comeback initiated by the S3-Mamba saga. RWKV, which is a hybrid between classical RNNs and transformers, is also worth mentioning.
https://www.youtube.com/watch?v=8u2pW2zZLCs
Lots of related papers referenced in the description.