Yes, that signature definitely exceeds our
signature guidelines (see item 9).
To get the years all on the same line, try replacing the paragraph marks with " / ".
For example, instead of this:
[url="https://www.goodreads.com/user_challenges/10188529"][u]2018[/u][/b][/url]
[url="https://www.goodreads.com/user_challenges/7160902"][u]2017[/u][/url]
[url="https://www.goodreads.com/user_challenges/3675297"][u]2016[/u][/url]
[url="https://www.goodreads.com/user_challenges/1803738"][u]2015[/u][/url]
[url="https://www.goodreads.com/user_challenges/1122134"][u]2014[/u][/b][/url]
You could use this:
[url="https://www.goodreads.com/user_challenges/10188529"][u]2018[/u][/url] / [url="https://www.goodreads.com/user_challenges/7160902"][u]2017[/u][/url] / [url="https://www.goodreads.com/user_challenges/3675297"][u]2016[/u][/url] / [url="https://www.goodreads.com/user_challenges/1803738"][u]2015[/u][/url] / [url="https://www.goodreads.com/user_challenges/1122134"][u]2014[/u][/url]
With no spaces between lines, which would produce this:
2018 /
2017 /
2016 /
2015 /
2014
That would solve the one line problem, but unless changes are made to the rest of your signature, it will still be too tall. Something has to go. As a guide, you can measure it against my signature, which has been deliberately maxed out for that very purpose. Let me know if you need any help.