Thanks to or for

English as a Second Language English Vocabulary, Grammar and Idioms
1

Thanks to or thanks for:
…Dave’s help.He did a great job.

2

Hi Rfaleet

Thanks for something.b[/b]
Thanks for your help.

Thanks to something or someone= because of something or somebodyb[/b]
Thanks to development of technology…
Thanks to Isaac Newton…
Thanks to…b[/b]
The things shows that you are grateful to someone.
Our thanks to all of you for your help…
Thanks to the effort of everyone…

So I would say: Thanks for Dave’s/her/his/your help.

3

Hello Richard,
Thank you very much for your consideration.