There is one legit accelerator that will actually confirm your tx and not just rebroadcast, and that it is ViaBTC!
The number of legit transaction accelerators is more than one. Binance offers transaction acceleration service to VIP users and regular users via Telegram. At the moment, it costs 0.002776 BTC to accelerate his transaction but I speculate those who have high VIP rank on Binance like VIP 5 or higher, it might be cheaper for them to accelerate it.
I looked at binance for one and they offered a service but at about 80$ i just don’t know anything about accelerators and if they would actually guarantee it to be processed
Good, they will definitely 100% include your transaction in next block if you pay. By the way, maybe ask if there are some Binance VIP users who can check your transaction on this page
https://pool.binance.com/en/acceleration because I think there is a chance, they may do it with discount for high VIP users. Or if $80 is okay for you and don't mind, then contact them via telegram @BinancePoolAccelerator