When I ping my Lightsail static IP, return just once then timeout. So I cannot using my domain name

Hello.

Since the name can be resolved using the dig command, there is probably no problem with the DNS settings.

dig conebeamcenter.com

; <<>> DiG 9.16.1-Ubuntu <<>> conebeamcenter.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2951
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;conebeamcenter.com.            IN      A

;; ANSWER SECTION:
conebeamcenter.com.     60      IN      A       52.204.225.76

;; Query time: 0 msec
;; SERVER: 127.0.2.2#53(127.0.2.2)
;; WHEN: Wed Mar 13 13:41:44 JST 2024
;; MSG SIZE  rcvd: 63

I can access it with the HTTP status 200 using the curl command, so I think the access problem has been resolved.

curl http://conebeamcenter.com -I
HTTP/1.1 200 OK
Server: nginx/1.18.0 (Ubuntu)
Date: Wed, 13 Mar 2024 04:41:20 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 18661
Connection: keep-alive
X-Frame-Options: DENY
Vary: Cookie
X-Content-Type-Options: nosniff
Referrer-Policy: same-origin
Cross-Origin-Opener-Policy: same-origin
Cf-Team: 1ed7b67d2f000020912b618400000001

It can also be accessed using HTTP using a browser.
If you cannot access it, please try deleting your browser's cache.

Try configuring your Lightsail firewall to allow ICMP packets.
https://docs.aws.amazon.com/lightsail/latest/userguide/understanding-firewall-and-port-mappings-in-amazon-lightsail.html