Congrats on completing Dovelems, Shmolem!
It was a long journey, but you finally did it! So that makes two packs you have finished, huh? Well done. I'm currently LPing the first pack you completed, Sublems.
As for other packs you can try your hand at, I can recommend Pimolems, Mobilems, and Lemmings Reunion. Note that I have only completed Pimolems on Lemmini, but the NL version has the exact same levels as the Lemmini version, with 3 extra levels that were added to the Special rank in the NL version so that there's 5 levels total instead of just 2 like in the Lemmini version. Also I still enjoyed the pack and can definitely recommend it. Starts off quite easy, but it does start getting difficult around the halfway point of the 2nd rank. The difficulty really picks up at the beginning of the 3rd rank and stays high up through the end of the Hurricane rank. Then you have the special ranks of Pickaxe and One, which both start easy and get difficult as you progress further in each one. The last pack recommended is the hardest out of the others I have recommended, with Pimolems the next one in difficulty, and Mobilems is the easiest of the recommended packs. Reunion has a nice difficulty curve but it gets difficult quite fast, much faster than the original game, but I'm sure it still won't be a problem for someone like you. It's also quite big, at 150 levels, tied with LPI. Perhaps since you're close to finishing that, you can try and complete that first or alongside whatever pack you decide to take on?
Or, if you're looking for much smaller packs to take on, I can recommend Lemminas which I just finished early this morning. The levels are quite easy for the most part, although it does have a decent number of shimmier levels. There were a few difficult levels, and one that I ended up struggling with a lot more than I thought, as seen by how I needed 3 videos in my LP to beat.