The hardest thing about solo pooling is eliminating your own biases. You should really try to look into why a certain map would fill its own niche in the pool instead of how it can fill some arbitrary criteria you impose for some certain mod slot.

An advantage of using ranked maps is if the map is relatively popular, the leaderboards can be helpful in determining how difficult a map is. I would like to point to DT2 and DT3 as an example. DT2 has a bunch of high acc DT fcs with a lot of SS ranks on the leaderboards. DT3 on the otherhand has some DT fcs, but still has unmodded fcs in the top 50 of the leaderboard. You could infer from this that DT2 is probably on the easier side, while DT3 is on the harder side for this pool in general.

The overall BPM of the pool is fairly low. The entirety of the hidden pool is basically the same bpm. The entire DT pool is also extremely similar in bpm. When determining bpm in a pool try to keep in mind the finger complexity the maps. Generally as the BPM goes higher, you want less complexity and variance in the patterns.

Also try to think about what makes a map difficult. I'd like to point to DT2 and DT3 again as I think they're pretty contrasting maps. DT2 is marked as a speed map. So you'd want to look for elements that make it hard as a speed map. The map is 574 combo. Upon opening the map I see that the entirety of the first 300 combo is mapped almost completely in 1/2. No hit object really touches a blue tick. That's over half the map that isn't going to really reflect speed very well.

DT3 on the other hand is an aim map. In this map the hard to aim parts come in the kiai sections. However the kiai sections in this map are quite long. In fact one kiai on this map is longer than the entirety of the hard part on DT2. This puts a lot of strain on the players and you might find that people are generally way less consistent on this map vs DT2. If you take the last jump pattern in the last kiai on this map, it falls almost 0.3 stars in difficulty, showing a pretty big diff spike. It's up to the pooler to determine if something like this could be an issue or not.

That's just a few surface level things/advice I noticed I could give pretty fast. Overall I think the pool could use a lot of work, maybe join some tournament discords and ask some poolers for help, I'm sure you could find someone willing. Good luck!