With new version the difficulty decreases of 0.5% for each block:

https://github.com/dubaicoin-dbix/go-dubaicoin/blob/733349c73a39297d94d509c1bf1730155ded2e4f/core/block_validator.go#L46

We need to wait 100 blocks to reduce diff of 50%...be patiente.

Dev is possible (Or if you think it's useful), in the future versions, difficulty adjustement in case of hashrate drop? for example reduce of 1/6 the diff if they are not found blocks for 2-3 hours (As done by bitcoin cash)? ...or something similar