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Your Chromecast should still keep working. The replacement streamer device would still work too, or the last gen chromecast with google tv.

Apple TV also works if you have a Mac. Many TVs also have Chromecast built in. Miracast is another option but it's really terrible. Steam Link is another option. There are also wireless HDMI adapters.

Miracast devices have pretty decent compatibility. Some TVs have it built in, but there are dongles that implement it as well. IIRC Microsoft has (had?) one that worked quite well.

Snatch up some 4k chromecasts on eBay while they're still available