Server error (5xx)... this usually means that the googlebot couldn't access the server when it tried to crawl your website.
I don't think there's anything you can do to fix this error, if memory serves me well it goes away next time when googlebot tries to access your site again, so just give it time!
Not found (404)... usually means that there's something wrong with that page, or with its URL. The 404s can happen when you delete a page but forget to 301 its URL to an existing page, or when there is a typo in the URL.
So, go to the page / its URL and double check that everything is OK. If it's not ok, simply fix the error and re-generate and re-submit the sitemap to your GSC
Excluded by "noindex" tag... this is probably the biggest problem on your site at the moment, because - if the excluded pages are important (ie. articles / content pages / category pages / etc) you want them to be indexed, so you need to remove the "noindex" tag from these pages.
Unless your theme added the noindex tag to some of your pages, or unless you added it accidentally, it's likely that your SEO plugin noindexed some of those pages, so check the SEO plugin first (just go to the noindex'd pages and check the "per page" options of the SEO plugin or other plugins that might add noindex tags, and remove that tag, then re-generate the sitemap and re-submit it to your GSC).
But be careful not to remove the noindex tag from non-important pages because some pages (archives, paginated comment pages, even author and / or tag pages in many cases) don't need to be indexed in search engines, so you should leave those pages appended with the noindex tag.
In other words, if the pages appended with noindex are NOT important (ie. author pages, tag pages, archive pages, paginated comment pages like I said, etc) then this "error" is not really an error and you can leave it like this.
So, you need to double check which pages are noindex'd and act accordingly by either removing the noindex tag, or simply not doing anything if the noindex'd pages aren't important to you and you don't want them indexed.
Crawled - currently not indexed... I don't think that this is fixable by you, as it's a google issue. You can probably help google to fix it by building internal links to these "Crawled - currently not indexed" pages from other pages on your site that are relevant and / or are getting traffic and / or stable rankings. But other than this I don't think there's anything you can do about it, so simply re-submit the sitemap every few days until the error goes away. If it doesn't go away after a week or two I don't know then, you probably can't fix it...