Here is a list of various OTA DVRs for cord cutters.
If you are already using FIresticks, the first one will work well for you.
If you want something that is more like your Cable TV service, the TIVO unit takes all of your streaming sources plus OTA channels and creates a programming guide. Expensive, since you have to pay $250 for the lifetime subscription. But cheap in the long run.
https://www.cnet.com/news/best-ota-dvr-for-cord-cutters-amazon-fire-tv-recast-tivo-airtv-and-tablo/