I hope you were able to fix your humidity problem and about the thermostats and hygrostats, here is a video that explains pretty well all that you need to know in order for you to choose which can be better.
https://www.youtube.com/watch?v=at9j...L&index=6&t=0s
Of course, if you want real quality I recommend you to get an Herpstat without a doubt (Which is not only a thermostat but a hygrostat too), but if you are seeking something cheaper you can try with INKBIRD, they have very good quality for the price.
I leave you some links from both.
Herpstat:
https://www.spyderrobotics.com/index...dkn96rkqj9una6
INKBIRD:
https://www.ink-bird.com/products-hu...er-ihc230.html
Those are the models that have the best quality, cost, benefit for their price.
If you are not into the DIY thing you can get a fogger but of course, it is going to cost more because of the brand.
https://zoomed.com/repti-fogger-terrarium-humidifier/