Usability issues reported by Google Lighthouse

I am using Hueman theme for my blog https://kumarvikram.com/ and running an Audit with Google Lighthouse tool has reported following issues. Please suggest how to address them or when theme developer will include fixes for the issues:
Links do not have a discernible name
Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn more.
View failing elements
<a id="back-to-top" href="#">
Background and foreground colors do not have a sufficient contrast ratio.
Low-contrast text is difficult or impossible for many users to read.
View failing elements

<p>
<a href="https://kumarvikram.com/setup-proxy-calling-google-analytics-reporting-api-v4/">
<a href="https://kumarvikram.com/google-analytics-report-v4-csharp-console-app/">
<a href="https://kumarvikram.com/identify-rpa-eligible-processes/">
<a href="https://kumarvikram.com/rpa-robotic-process-automation-not-robots-already-know/">
<a href="https://kumarvikram.com/best-black-friday-learning-deals/">
<a href="https://kumarvikram.com/category/asp-net/">
<a href="https://kumarvikram.com/category/c-sharp/">
<a href="https://kumarvikram.com/category/certification/">
<a href="https://kumarvikram.com/category/general/">
<a href="https://kumarvikram.com/category/iot/">
<a href="https://kumarvikram.com/category/javascript/">
<a href="https://kumarvikram.com/category/mongodb/">
<a href="https://kumarvikram.com/category/node-js/">
<a href="https://kumarvikram.com/category/phonegap/">
<a href="https://kumarvikram.com/category/productivity/">
<a href="https://kumarvikram.com/category/rpa/">
<a href="https://kumarvikram.com/category/security/">
<a href="https://kumarvikram.com/category/travel/">
<p>