My suggestion is to get rid of the IOT device. It is too costly of an idea, and very difficult to implement.
I don't know much about code development, but is there a way to cap the total number of coins available? Right now it is infinite, I think. There should be a total coin cap.
Also, Reduce staking rewards by a large amount. Inflation is too high. Too many coins are circulating and they have too low of value. Maybe remove staking all-together for one full year to let the price catch up to the supply and demand. Set staking rewards to 0 for a year.
Continue marketing the coin in the meantime. I think it will pick up some value this way. Too bad there is no coins to burn, otherwise burning a lot of coins could help.
I like rain because of the random rewards system, it is like a rain cloud of coins gets dumped on your wallet. This feature was fun, innovative, and very beneficial to rain. I think inventing new fun and engaging systems like that will help the currency become popular again.
I don't think re-starting a new chain is a good idea. Rehabilitating the current chain and coin is a very good challenging project. I think lots can be learned from it. I hope you choose this path.
Best