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Unfortunately, Minecraft 1.14 was not that excellent, at the very least, not as good as Minecraft 1.15 while Minecraft 1.13 was probably even worse. So what does that mean for Minecraft servers? Well, the majority of servers got stuck on Minecraft 1.12 and those that did update after Minecraft 1.12 mostly went straight to Minecraft 1.15.
You'll see exactly what I mean if you go to vote sites and search for Minecraft servers. In the end there's no reason why you should still use Minecraft 1.14 It's likely to be better off using the latest Minecraft client, or at a minimum version 1.15 because Minecraft 1.14 also had a few client-side bugs.
If you still insist on using Minecraft 1.14 but aren't sure how to do it, there's hope. Most of Minecraft servers now support a whole range of clients, which means you can join 1.15 Minecraft servers with 1.14 client if you truly want to use the 1.14 version.