Half a dozen cherry shrimp - for shrimp to feel comfortable (brazen wanderers) they need rather more numbers, 10-12 is a better minimum number (when these shrimp first entered the hobby, no one would sell fewer than 10), select a mix of sizes as you’re more likely to obtain mixed sexes, males are always smaller, and often less intensely coloured, though most shrimp sp. can quickly vary color intensity
Light level - are you still running 60%?
Especially with the floating plant now multiplying, your MC may benefit from more light - that right back corner may be a “dead” spot with limited CO2 + less light, so MC is less inclined to grow in that direction
Nesaea crassicaulis can usually recover as long as you have some intact healthy stem with leaf nodes, just trim away all the melt/about to melt leafs and stem ... but it’s also a rampant grower if happy
The right aquarium plants
tropica.com
Of course by now your tank undoubtedly looks quite different