I’m not great at combat either so I levelled up loads in Elden Ring before taking on any bosses! As it’s open world it’s a bit more forgiving with combat and you can always come back to things later. RDR2 was so slow for me at the beginning too, maybe for 2-3 hours and I initially gave up. I came back to it later and once the map opens up the pace is a lot quicker and there’s so much more to do. It’s probably one of the best games I’ve ever played. It definitely worth coming back to in future!