<p>You may have picked up a fan.</p>
<p>I looked at the reputation over time plots for the 36 highest reputation users (the <a href="https://stats.stackexchange.com/users?tab=Reputation&amp;filter=all">first page of users</a>, sorted by all time reputation), and I don't see any others with such an inflection point.  I likewise looked at the users with reputation ~10k (i.e., similar to you, in that respect), and I once again see no others with that pronounced change in slope.</p>
<p>Your inflection point comes about halfway into the portion of 2020 that has elapsed so far.  If I look at your plot of reputation changes per day for 2020, I see that you started getting a higher density of upvotes around the beginning of April.</p>
<p><a href="https://i.stack.imgur.com/UzA62.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UzA62.png" alt="enter image description here" /></a></p>
<p>If I look though the <a href="https://stats.stackexchange.com/users/11867/cam-davidson-pilon?tab=reputation&amp;sort=post">individual posts</a> associated with those upvotes, they are mostly all unique.  That suggests someone has started systematically reading your old posts and upvoting many of them.  Since you have a finite number of posts, this phenomenon won't last forever, but enjoy it while it does.</p>
