But These Conflict with Your Requirements or Minimum-Stability

Composer: conflict with your requirements or minimum-stability

Create a composer.json file with minimum-stability specified:

{
     "require": {
         "phpseclib/mcrypt_compat": "dev-master"
      },
     "minimum-stability": "dev"
}

http://getcomposer.org/doc/04-schema.md#minimum-stability

The minimum stability defaults to stable if not specified.

Composer - conflict with your requirements or minimum-stability

aloha/twilio is not the problem.
You have a conflict with packages aws/aws-sdk-php and league/flysystem-aws-s3-v3.

Laravel/nexmo conflict with elasticsearch/elasticsearch your requirements or minimum-stability

locked at v7.3.0, required as 7.0.2 sounds as if your composer.lock and composer.json files are out of sync. Try deleting composer.lock and your vendor/ directory (if it exists), and do composer install.

If that works, update your composer.json to require the correct version of Elasticsearch you need. composer update elasticsearch/elasticsearch:^7.3 should probably work to do that.

How to resolve the Composer dependencies conflicts (a clean way)?

You are already using multiple versions of Symfony packages in your composer.json, like:

    "symfony/asset": "5.0.*",
    "symfony/console": "5.0.*",
    "symfony/debug-bundle": "5.0.*",
    "symfony/dotenv": "5.0.*",
    "symfony/framework-bundle": "5.0.*",
    "symfony/routing": "5.1.*",
    "symfony/yaml": "5.0.*"

You should clean that up to avoid incompatible packages. Do this either by using Flex, or by setting all package versions by hand

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Usage of Flex

Set all Symfony related dependencies to "*", configure the Symfony version like this:

"extra": {
  "symfony": {
    "require": "5.2.*"
  }
},

Afterwards, update the Symfony dependencies through composer update "symfony/*".

Any later upgrade to the next version requires only a single change in this section.

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"Manual" configuration

Set all Symfony related dependencies to "5.2.*", update them through composer update "symfony/*"

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