Wordpress fixes + SEO for WordPress Website

Hello and thank you for your interest in my job offer.

I need someone to help me with my Wordpress Landing Page.
Currently I have some problems where I do not have the time to fix them.

I do not get a complete HTTPS certificate because some images from my website are loaded with HTTP.
The website is protected by Cloudflare. The problem is "mixed content".

Then I have a problem with the right one. I can access everything via FTP, but as soon as I want to upload something via the admin panel, I always have to specify the FTP login data and it still does not work. Even updating plugins does not work.

Then I would need help with SEO and Advertising. Since I have no experience in this area, I rely on you! It is a landing page for an SMM panel.

If this sounds interesting and feasible to you, please do not hesitate to contact me.