.carousel-indicators [data-bs-target] {
box-sizing: content-box;
flex: 0 1 auto;
width: 10px; /* change width */
height: 10px; /* change height */
padding: 0;
margin-right: 3px;
margin-left: 3px;
text-indent: -999px;
cursor: pointer;
background-color: #fff;
background-clip: padding-box;
border: 0;
border-top: 10px solid transparent;
border-bottom: 10px solid transparent;
opacity: .5;
transition: opacity .6s ease;
border-radius: 100%; // /* add border-radius */
}
<ol class="carousel-indicators">
<li data-target="#mycarousel" data-slide-to="0" class="active"></li>
<li data-target="#mycarousel" data-slide-to="1" ></li>
<li data-target="#mycarousel" data-slide-to="2" ></li>
</ol>
.carousel-indicators li {
width: 10px;
height: 10px;
border-radius: 100%;
}