Keep using FreshRSS, just deploy something like fivefilters-full-text-rss-docker alongside it, to get full text RSS feeds from websites, that don't provide them. If you don't want to self-host, there's morss.it. Chris Titus Tech once made a few videos about this:
https://invidious.fi/watch?v=nxV0CPNeFxY
https://invidious.fi/watch?v=Y1Ho_RrF_9I
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