There is no way to manage dead coins if the developers walked away, you can use a new wallet so you can leave your wallet where all your dead coins are stored
Sadly, such method not always help. I used to have a wallet with dead or garbage coins. This forced me to create another wallet and move most valuable alts with me. But then it got loaded with that crap again. Specially in last quarter, BSC wallet mainly. It got fillled with scam tokens, which I usually receive almost every 1-2 weeks. These 30+ airdropped scam distract me a lot.