[AmirGT]

if im not wrong cloudflare certificate is actually have really long expiration date unlike lets encrypt 3 month

for lets encrypt itself without the cloudflare part you can use certbot and it is compatible with apache and nginx . the problem is that it doesnt support free cloudflare . you need to pay for using ucstom certificate . so just use cloudflare certificate

You can use Buypass SSL, it's valid for 6 months, or TrustAsia, it's valid for one year but both are only DV, they don't support multi-domains or wildcard unlike Let's Encrypt.
Get Buypass SSL from HERE / Get TrustAsia SSL from HERE