1.carousel-indicators [data-bs-target] {
2    box-sizing: content-box;
3    flex: 0 1 auto;
4    width: 10px; /* change width */
5    height: 10px; /* change height */
6    padding: 0;
7    margin-right: 3px;
8    margin-left: 3px;
9    text-indent: -999px;
10    cursor: pointer;
11    background-color: #fff;
12    background-clip: padding-box;
13    border: 0;
14    border-top: 10px solid transparent;
15    border-bottom: 10px solid transparent;
16    opacity: .5;
17    transition: opacity .6s ease;
18    border-radius: 100%; // /* add border-radius */
19}
20

1.carousel-indicators li {
2  width: 10px;
3  height: 10px;
4  border-radius: 100%;
5}
6

1                <ol class="carousel-indicators">
2                    <li data-target="#mycarousel" data-slide-to="0" class="active"></li>
3                    <li data-target="#mycarousel" data-slide-to="1" ></li>
4                    <li data-target="#mycarousel" data-slide-to="2" ></li>
5                </ol>
6