Tweak 18 WordPress issues for a professional website

General information for the website: Job Board for Professional
Kind of development: Customization of existing website
Num. of web pages/modules: 30
Description of every page/module: Wordpress website using woocomerce plugin and themeforest design.

Here is the tweaks that need to be done (full details will be given to the appropriate expert):
R- Change Woocommerce Email Template (Header size)
Q – Change Woocommerce Text on check out
P- Change Text on specific page
O- Add Captcha on Sign-Up Form
N – Change Text on specific
M- Add Pop-up
L – Add sharing button to blog Post
K – Photo and text to display correctly on mobile
J – Direct User to specific page after Checkout
I– Improve Speed
H - Make the search box only for the Blog Post
G - Update Woocomerce Plugin (and all others) while keeping previous customization (list given)
F- Resolve job displays
E –Check if website is website is working on any browser
D –Display Footer Picture correctly
C- Change the colour
B- Change Favicon colour
A – Change Text in Sign-Up
Description of requirements/features: The site is using 30+ plugins that are updated all the time.
The site use child theme.
The tweaks need to work after the plugins are updated. Use SEO friendly code. The speed should stay low.
Extra notes: Please only apply if you have 5 year+ experience