Micro Entrepreneur about to become VAT registered

I am a Micro Entrepreneur (registered in Dec 2022). My turnover is approaching the 36,800 threshold so I contacted the Tax office to ask about a TVA number.

My situation:
- I only invoice outside France (in EU), on my invoices there is a TVA intra-communautaire and the mention “Exonération de TVA, article 283 du CGI”. I do not charge TVA, there is a reverse charge involved (customer is in Belgium).
- I requested the TVA intercomunitaire early this year so I can invoice my customers in EU.
- I am filling the DES Declaration Europeenne de Services every month regarding the intra community VAT.
- With my next invoice (that I will issue next week) I will still be under the 36,800 threshold, but with the invoice after that (issued end of July) I will get over the threshold.

The tax office answered the following

“quand en matière d’activité de prestations de services, on dépasse le seuil de 36,800 euros, on est obligé de passer au régime supérieur: soit le régime simplifié de TVA qui requiert une déclaration annuelle, soit le régime réel de TVA avec une déclaration trimestrielle ou mensuelle.
Je vous invite donc à m’indiquer quel régime vous souhaitez: le régime simplifié ou le régime réel normal.
Une fois que le service vous aura changer de régime, cela générera l’acquisition d’un no de TVA intracommunautaire, qu’on vous transmettra et qu’il faudra mentionner sur vos factures.
“

My questions:
1 - Which service should I opt for simplified or reel. To me, the monthly declaration sounds better (reel).
2 - What will change on my invoice once I become TVA registered? Do I need to add the TVA number near the TVA intracommunautaire ? I suppose the “Exonération de TVA, article 283 du CGI” will have to stay on my invoices.
3 - If opt for “regime reel” and I continue invoicing outside France then I suppose the monthly declaration of TVA will be fairly simple as I don’t charge TVA. Is this correct?

Thank you very much in advance