I think the main problem with Shina Inu is that its developers no longer know what to do to continue attracting the attention of new investors. There are several options in terms of greater privacy, one of those options is Monero as we already know, and although everything can be improved, Monere offers a lot of privacy. We only have to look for information on the internet to know that even the NSA published a report that talks about how robust the Monero blockchain is, and that not even their engineers are capable of penetrating that security.
Shiba Inu is a meme coin and was designed and released to make quick money while the whales wait for new investors, the most recent example being Pepe.