Recovering coins from mist

Back in 2017-2018 I was mining ether to a software wallet called MIST. I stopped mining for various reasons after getting about 5 eth. Last year I tried accessing my wallet but Mist wouldn't connect to the Blockchain because the software is apparently no longer supported. I'm not sure if the key that I used with the mist wallet was specific for that software (in which case the chances I will be able to access these coins is slim) or if it is the same key I need to access my coins directly on the blockchain. Not sure where to get started any advice appreciated