He Who Fights with Monsters by Shirtaloon has been great. Combat is fun and the dialog is increadable. I would avoid the audio book as it falls into the trap of having a stat sheet that is read out but the book for me is a must read. I would desibe this a a Isekia/Gamerlit with some great character building.
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Swing Shift by William D. Arand (Randi Darren is the same author) is another great book filled with modern fantasy fun. I would describe it as a mix of fantasy/mystery/action. All of this authors books share the same universe which is a plus.
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I would also recommend Demon Accords series but I would say it has some inexplicable character moments that really brought the series down as a whole. The Power Creep is also off the charts.
Here's a link. It's a bit slower than Daniel Black and the protagonist takes several books to start getting close to Daniel's level of power, but you should like it. I certainly enjoy the Daniel Black series and my book has many of those same concepts worked in it.
Wild Wastes is a pretty safe bet if you want the base building harem story.
These days there are a ton of harem fantasy novels out there, including my own books, which I wrote to try and capture the feels I had when reading Daniel Black for the first time, which was my introduction to the series.