Your cookery skills will hold you in great stead, there are some wonderful low carb recipes all over the internet and indeed in this forum for low carb goodies and meals both savoury and sweet, it’s a big learning curve but you have good knowledge you’ll do fine just give yourself time to digest the changes.
As to things you no longer can use like others said food banks or maybe if you have a local charity that is doing cooking classes and meals for those who need them maybe take them there, or a homeless charity etc. if your on Facebook on your local page you could pop them on there, I’ve done that in the past. Churches and charities are always looking for stuff for raffles, hampers etc.