Hello,
My name is Francesco ,nice to meet you,
I checked your website, I suggest following google insight advices in order to improve speed, so compressing css/images/javascripts, this will make the total size smaller and the website will load faster.
Regarding mobile, i suggest making it responsive using CSS commands, is the best way to proceed,
About SEO i suggest adding more content, adding H tags, metas, and all the standards elements very appreciated by search engines, Also some link building would help a lot in order to rank better.
Let me know if you wanna discuss further about your project!
Thank you for your time