Hi
You may update to Joomal 3.10,
BUT!!! you will can't rollback to Joomla 3.9. So please first do backup, With that you not lost nothing important
Also please check: Joomal 3.10 more heavy compare with Joomla 3.9
If you have production site I advise for you wait as small 2 months,
We for new clients already represent OrdaSoft
Joomla 4 Gallery, On This or next week we will release it for all our clients
Regards
OrdaSoft team