I suspect a key phrase here might be since Covid. If that's the case then please cut yourself some more slack. Even enjoyment takes energy. It might be that emotion, however pleasurable is more than your system feels up to. It might be that you need to build up your general health and well-being with walking, small scale sociability, small treats and much less emotionally demanding reading for a while.

I have found refuge in Terry Pratchett's books and although there are deep emotional elements I only engage with them as much as I feel up to. Otherwise he tickles my sense of humour, word play, imagination. His writing can be appreciated on different levels so you can race through with the plot or find joy in just a few pages of carefully honed writing.